Baby Name Letters: What’s your favorite O name?

Oh my goodness!

O Baby Names — names that start or end with the letter o — is one of our longest lists, with 16 pages of names totaling more than 150 selections.

O Names are also among our most enduring classes of cool names, first introduced in the original Beyond Jennifer & Jason and still going strong, with lots of new entries to the group.

The O Names include such hotties as Oscar and Milo, Theo and Owen and  Olive (though O names are more often for boys).

Then there are such rising stars as Orion and Oz,  Indigo and Cato.

There are classics among the O names, too: Octavia, Olivia, Oliver, and Otto, for instance.

And of course, the O names also include such cool international choices as Viggo and Mateo, Laszlo and O’Brien.

In fact, we believe there’s an O name to suit every sensibility and style.

Do you agree?  Which O name or names do you like best?

Illustration by Frances Pelzman Liscio. Her botanical initials are available in The Nameberry Store.

Also in our store now at over 70 percent off: Our charming family trees, lovely nursery decoration or baby gift at under $10.

And now for some of our favorite O names:

Benno

Picture 1 of 12

Benno is one of the most distinctive and undiscovered of the o-ending boys. Though it sounds like an Italian play on Ben, it’s actually German, the name of an 11th century saint, patron of anglers, weavers and—sufferin’ succotash!—alliteration. Two notable bearers: Benno Schmidt Sr., the venture capitalist who invented the term venture capitalist, and Benno Schmidt, Jr., one-time president of Yale.

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79 Responses to “Baby Name Letters: What’s your favorite O name?”

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Plutophelia Says:

March 12th, 2014 at 10:36 pm

Ophelia and Opaline

NellieDellie Says:

March 12th, 2014 at 10:55 pm

Ophelie

tintri Says:

March 12th, 2014 at 11:00 pm

Love Viggo and Hugo! And, dare is say, Woodrow is a favorite of mine – even though it includes a “w.”

augusta_lee Says:

March 12th, 2014 at 11:03 pm

I love strong O names. In fact, I love then a bit too much. How to choose between Roscoe and Marlowe, Margo and Juno, Isabeau and Clio, Ivo and Jago — never mind Octavia and Ophelia, Odette and Odessa, Oberon and Orlando? Waldo, Winslow, and Coco are all guilty favorites. Shiloh is another solid choice, though tainted for me by the celebrity association. I expect to see Arlo, Milo, Leo, and Otto continue to rise. I’d also bank on girls’ names with a strong O sound — Nova, Lola, Eloise, Ramona, Willow, Annora, Cora, Aurora. I think they’re all potential hits.

Adriennejune Says:

March 12th, 2014 at 11:04 pm

I have always loved Odessa, although I don’t think I have will ever have the guts to use it.

BabyNinja143 Says:

March 12th, 2014 at 11:08 pm

I think my favorite O names are Orianna and Orson.

MauveBird Says:

March 12th, 2014 at 11:12 pm

Odette, Odelia, Oswin and Oscar are the only ones I like enough to use myself.

kacl Says:

March 12th, 2014 at 11:13 pm

Orson and Ottoline
Viggo and Milo which are both unusable 🙁
Indigo and Cleo

frustratedauthor Says:

March 12th, 2014 at 11:30 pm

Girls: Ophelia

Boys: Viggo, Milo, Alonzo, Ossian

Erinm Says:

March 12th, 2014 at 11:50 pm

Owen and Orla

KateMP91 Says:

March 13th, 2014 at 12:04 am

Girls: Marlo, Margo, Rio, Valo

Boys: Otto, Arlo, Orlando, Benno, Emilio, Apollo, Diego, Cato

jessiemay Says:

March 13th, 2014 at 12:18 am

Starting with O I love Owen and Olive (although Olive is my sister and Owen is a close family friend’s child, so both off the table for future children), and ending with O my favourites are Matteo and Nico/Neko.

lalala__lauren Says:

March 13th, 2014 at 12:29 am

Looking at my long lists, I have Olivier for the boys (seriously swoon-worthy!) and Odette, Olwen, and Ottilie for the girls. I like Olivia and Oliver as well. Lastly, Owen seems like the perfect “cute kid turned classy adult” name in my book.

sarahmezz Says:

March 13th, 2014 at 12:31 am

Favourite names starting with O: Opal, Orla and Oscar.

Favourite names ending in O: Hugo and Margo. Also, my Italian boys, Marcello, Marco, Massimo and Matteo.

cmhinken Says:

March 13th, 2014 at 1:05 am

Otis is a strong family name, always had a soft spot for it, though my guess is it will end up as a middle name. For girls, I adore the nn Ollie, and prefer Olivia to Olive, though both are becoming so popular!

ellieberry Says:

March 13th, 2014 at 1:48 am

Oscar, Orion, Rocco, Roscoe, Xavio, and Lazlo make me happy but my favorite O name is defiantly Bruno!

For girls I love Ottoline, Indigo, Ophelie, Juno, and Winslow

Elizabethclaire Says:

March 13th, 2014 at 1:51 am

Arlo and Oswinn

Elina Says:

March 13th, 2014 at 2:08 am

I love Oscar, Oriana, Octavia, Orion, Ottilie and Ottoline to name a few.

scgogirl Says:

March 13th, 2014 at 2:58 am

Orion
Oakley
Ottilie
Olive
Oliver

IsabelleMarie Says:

March 13th, 2014 at 3:22 am

Odette
Odelia
Ondine
Ottoline
Ophelia

tree_loves_eth Says:

March 13th, 2014 at 3:55 am

Cleo is my favourite!

chellemma1 Says:

March 13th, 2014 at 4:13 am

I tend to like names starting in O for girls and names ending in O for boys:
Girls: Orla, Ola and Ottilie
Boys: Jago, Leo, Theo, Dario and Nico
Also Rio for a girl is a guilty pleasure of mine!

findemaxa13 Says:

March 13th, 2014 at 5:55 am

I’m definitely not alone in this, but I love Olivia. My second-favorite is Opal.

matti12 Says:

March 13th, 2014 at 6:17 am

I LOVE Ofelia! Oliver is also nice for a boy, and Olive for a girl I think is cute.

jjayx Says:

March 13th, 2014 at 6:19 am

Girls: Cleo, Orlaith

Boys: Hugo, Oliver, Orson, Oscar, Rocco, Theo

sarah15 Says:

March 13th, 2014 at 6:21 am

There’s are so many! But my favourites are Arlo, Orrin and Oscar for boys and Olive, Orla and Ophelia for girls 🙂

sarah15 Says:

March 13th, 2014 at 6:22 am

*There…. Gotta love autocorrect!

livia Says:

March 13th, 2014 at 6:26 am

Margot, Willow, Orla, Harlow (for both genders – guilty), Rowan, Jago, Theo, Roscoe…

SeaZuno86 Says:

March 13th, 2014 at 6:33 am

I love O names! Unfortunately, our last name ends in -o so we can’t use most of them. My favorites are Owen (top choice for a baby boy… we would nn him Oz as our last name begins with Z-), Otis, Otto, Viggo, Theo and Margo.

freddiethepink Says:

March 13th, 2014 at 6:44 am

My faves for the boys are:

Oberon, Ozias, Odysseus, Oswald, Leonardo, Viggo – and I love the nicknames Ozzy, Leo, Deo and Roo 🙂

For the girls the only ‘O’ name I really like is Juno!

spotlightstarlit Says:

March 13th, 2014 at 7:16 am

Olive, Ophelia and Leo

JessicaT11 Says:

March 13th, 2014 at 7:18 am

Boys: Owen (and Logan if it counts)
Girls: I don’t really like any for girls. Maybe Margot or Zoey, and I like Isobel with an O.

Cloverish Says:

March 13th, 2014 at 7:57 am

I love O. I don’t mind names starting with O, but I really love those that end with O or that contain a strong O sound, like Roscoe and Inigo.

LuMary Says:

March 13th, 2014 at 8:14 am

Obadiah or Orion. There was a boy drummer in the Civil War, for the Union, if I recall correctly, named Orion. I think it would make a nice choice for a girl. Also, it’s a good biblical name, the constellation Orion being mentioned in Scripture (Job).

LuMary Says:

March 13th, 2014 at 8:16 am

I also like: Oliver, Otis, Otto, Orla/Orlaith, Leo, Theo (for a girl, too).

peach25 Says:

March 13th, 2014 at 8:27 am

Olivia, Chloe, Zoe
Owen, Leo

jdouglas Says:

March 13th, 2014 at 8:32 am

Olympia

Arlo, Leo, Oberon, Orion, owen

miloowen Says:

March 13th, 2014 at 8:57 am

Well, Owen, of course, since it’s my name — although I prefer the Celtic spelling Owein or Owain. And I could never use it, although I went to school with a kid named Owen Owens.

I love the name Olwen — but outside of Wales, Olwen Owen wouldn’t work. Still, love the name.

Girls: Olympia, Octavia, Orla, Ofra, Orpah, Ottilie; Clio, Chloe, Caro (nn for Caroline), Doro (nn for Dorothy).
Boys: Obadiah — love this name! — Ottar (the name of my great-uncle), Ottavio, Orazio, Leo, Rocco, Theo, Waldo (another great-uncle).

laurenruthie Says:

March 13th, 2014 at 9:30 am

I have more names lists than most everyone but nameberry … But my top of the top list are ones I’d actually name my own future children. The 4 O names there are:

Oona
Octavia
Otto
Woodrow (row, for short)

Family O names run deep. My grandfather is Woodrow. My other grandpa is, are you ready, RONDO. Rondo Isaac, to be exact. A good man. I think it’s a cool, odd, yet oddly hip, musical name that I can appreciate, but won’t use myself. I haven’t seen it listed on name sites, but it seems appropriate to bring up now.

iheartnames Says:

March 13th, 2014 at 9:53 am

Boy faves: Owen, Orion, Osric, Oliver, Enzo, Lorenzo, Alonzo, Alphonso, Laszlo, Antonio, Sergio

Girl faves: Ondine, Olivia, Oriana, Odalys, Oceana, Coco, Rosario, Margo, Jojo, Lilo, Domino

Tina_and_Bert Says:

March 13th, 2014 at 9:54 am

Mmm, I’m not really into this trend, but I LOVE Jethro! That, and Leo are my two boy loves from the long list, though I was surprised that I thought Oren a good boy name, too, though I would never use it. For girls, Olive and Opal are the only ones I would ever even consider using, but I did notice Orchid on the full list and had to catch my breath! So lovely and unexpected, yet totally usable (to me, at least). And Oona makes me smile, even if I feel it wouldn’t “work.”

handsallover Says:

March 13th, 2014 at 10:01 am

Actually, I love a lot of names either ending in O or starting with it. Leonardo and Oscar, Olympia(;)) and Olive, Hero and Orlando, Octavia and Franco, Olga and Mateo, Odessa and Cosmo. I would name my son Oz in a heartbeat!

haileylauren Says:

March 13th, 2014 at 10:52 am

Juno is my top pick for my first girl. I adore Juno.

iolite Says:

March 13th, 2014 at 11:04 am

My favourite for a girl is Ottilie and my favourite for a boy is Oscar.

Madelyn Says:

March 13th, 2014 at 11:14 am

Oh, so many O names on my list!

For girls I like Juno, Kielo, Octavia, October, Ofelia, Olive, Olivet, Olivine, Olympia, Ondine, Opal, Orla, Ostara, Ottoline, Rio.

For boys I like Arvo, Benno, Brio, Bruno, Cicero, Colorado, Eero, Falco, Jago, Laszlo, Lazaro, Lobo, Ludo, Oberon, Ogden, Otto, Rio, Rodrigo, Tiago, Vireo.

chicamerlin Says:

March 13th, 2014 at 11:40 am

Octavia is definitely my favourite, but I also have a huge liking for girls’ names that end in “o”, like Rio, Harlowe, Margot, etc.

krisscouture Says:

March 13th, 2014 at 11:47 am

Odessa is my favorite O name. So beautiful!

lisaer Says:

March 13th, 2014 at 12:04 pm

I was just thinking yesterday how much I love names that have a strong O sound in them.

Girls: Ophelia, Margot
Boys: Otto, Hugo, Owen, Oscar (which unfortunately is very out due to fiancé’s last name)

I also love names that feature a prominent O sound but don’t necessarily start or end with it.

Girls: Paloma, Ramona, Calliope, Persephone, Elowen, Leonore, Cassiopeia, Solange
Boys: Bartholomew, Timothy, Theodore

AprilRobin Says:

March 13th, 2014 at 12:14 pm

Ophelia, Oliver, Opal, and Harlow are my favorite O names

Plum4 Says:

March 13th, 2014 at 12:49 pm

I love O names. Always have, always will. These are some of my favorites.

Boys: Theo, Roscoe, Hugo, Oliver, and Leo
Girls: Olive, Odette, Marlow, Lola, and Ramona

fairchild Says:

March 13th, 2014 at 1:22 pm

Viggo, Theo and Milo!
And Margot for a girl 🙂

SheFliesWithHerOwnWings Says:

March 13th, 2014 at 1:41 pm

I adore Ottilie and Olwen for girls but I’m not keen on O names for boy’s really. I don’t mind Oscar for a middle name! However, I love boy’s names that end in ‘O’ such as Theo, Milo and Cato.

kryssiz87 Says:

March 13th, 2014 at 1:43 pm

Oscar for a boy, Olivia for a girl!

OpheliaFlora Says:

March 13th, 2014 at 1:44 pm

Ophelia & Oscar are my favourites beginning with an O.
I love Theo & Leo which both obviously end in O.
A lot of my favourites actually have an O somewhere in them, more or less present.
I live the strong sound in names like Leonor, Flora, Eleanor, Nepomuk and Viola or the more subtle O in Elliott.
O is a fantastic letter!

OpheliaFlora Says:

March 13th, 2014 at 1:45 pm

Ophelia & Oscar are my favourites beginning with an O.
I love Theo & Leo which both obviously end in O.
A lot of my favourites actually have an O somewhere in them, more or less present.
I love the strong sound in names like Leonor, Flora, Eleanor, Nepomuk and Viola or the more subtle O in Elliott.
O is a fantastic letter!

OpheliaFlora Says:

March 13th, 2014 at 1:45 pm

Sorry for the double post :/

JH Says:

March 13th, 2014 at 2:29 pm

Leo! (My son’s and grandpa’s name).

KickinKay Says:

March 13th, 2014 at 2:47 pm

Leo is definitely my favorite O-ending name, for girls I also love Cleo and I find Dido interesting. For names that begin with O, Owen will always be my favorite for a boy, and October and Ottoline are tied for girls 🙂

Skyesime98 Says:

March 13th, 2014 at 3:39 pm

My number one girl’s name is Juno. I love the strong sound the O makes and can imagine a cute little tomboy in a flowery dress and converse playing in the dirt wearing it.
Girls: Juno, Sephora/Cephora, Orchid, Olympia
Boys: Lazlo, Oberon

dresdendoll Says:

March 13th, 2014 at 3:46 pm

I love Oslo and Silo.

Saracita00 Says:

March 13th, 2014 at 3:54 pm

I WISH there were an O name to suit everyone. O is one of my favorite letters, and my husband inexplicably hates them all! My very top starts-or-ends-in-O favorites are Oriana and Willow, Ivo and Isarno.

I also admire Ondine, Odette, Odelia, and Oleanna for girls. For boys, Viggo, Vittorio, Ozias, Oliver, Inigo, Lorenzo, Rio, Amadeo, Horatio, Leonardo, Rogelio and Rysio (ancient variations that would serve to update Roger and Richard!).

Though it’s not my particular favorite, I think Obadiah is right on trend with the rediscovery of Biblical names and it’s cool-O initial.

senoritashan Says:

March 13th, 2014 at 4:25 pm

Oberon, Hugo, and Io!

Jennai Says:

March 13th, 2014 at 5:02 pm

Benno (my teacher’s son’s name), Orlando, Alvo and Yego.

befx217 Says:

March 13th, 2014 at 6:05 pm

Boys – Viggo, Theo, Milo, Hugo, Leo, Oliver, Owen & Oscar
Girls – Olivia, Ophelia, Orla, Juno, Harlow, Willow,

detty Says:

March 13th, 2014 at 6:26 pm

My name is Odette, and love how strong but feminine it sounds. Among top choices for baby names are Orla and Oscar. Also like Ophelia (but seems a little pretentious for real life) and Orianna. Always loved Hugo but probably too afraid to use it!

ashthedreamer Says:

March 13th, 2014 at 6:49 pm

I’m not sure I can list just one! I’m surprised by how many “O” names I like, actually.

Girls:

Olivia
Olive
Odette (omgoodness, love this so much! My best friend’s little sister’s mn is Odette, and I think it’s so chic and French and completely full of feminine strength. I would love to meet a little Odette!)
Odile
Odilia
Opal
Hero (I adore this, and I adore Much Ado About Nothing… Why has Hero not caught on, at all?!)
Ophelia

Boys:

Owen
Cato
Oscar
Hugo
Leo
Orion
Oberon

And it doesn’t start with or end with an “O”, but it does have a prominent “O” sound, and I adore it: Josiah!

Anotherkate Says:

March 13th, 2014 at 7:56 pm

I love names that feature a predominant O sound,… Actually at the moment every name on my top 5 except Audrey has an o in it (though not at the beginning).
I’m secretly hoping if my pregnant friend (married to Irishman) has a girl she goes with Orla or orlaith. I think it’s gorgeous.

I love Benedict with the nn benno… Unfortunately the boyfriend doesn’t seem too keen on the ending of the full name.

Llumeneres Says:

March 13th, 2014 at 8:32 pm

I have a surprising number of names with O somewhere in them on my list… My favorites would have to be:

Otto, Oscar, Milo, Leo, Theo, Ozias nn Oz, Hugo, and Laszlo for boys
and
Ophelia, Octavia, and Juno for girls.

Isolde? Magdalene? Juno? Rhiannon? Annora/Honora? Magnus? Homer? Morris nn Moss? Theo? Oscar? Ozias nn Ozzie? Octavia? Juno? Laszlo nn Lasz?

Llumeneres Says:

March 13th, 2014 at 8:33 pm

Sorry. That was a list of “potential” names to be added to my favorites list that got pasted on there 🙂

Poppy84 Says:

March 13th, 2014 at 9:27 pm

I am working very hard on my husband to put Orson on our list for a potential second son. If I were naming another boy by myself today he would definitely be an Orson.

Juno is probably my favourite “O” name for a girl.

Runners-up would be:
Hugo and Ophelia

SiobhanJ Says:

March 13th, 2014 at 9:40 pm

Orla and Leo

evergreen Says:

March 14th, 2014 at 1:45 am

Beginning with ‘O’ I adore Odette.

Also really like Orson.

Others I like are Odessa, Oliver (it’s very popular here, but I do love it, and I have known a beautiful man inside and out called Oliver)

Ending in ‘O’ I really like Juno, Enzo and Leo

indiefendi Says:

March 14th, 2014 at 2:35 pm

Indio, Matteo, Orion, Rosario, Ophelia (dislike the connotation though), Rocco, Dario, Marco, Fernando, Giorgio, Emilio, and Otto are ones that I like. 😉

indiefendi Says:

March 14th, 2014 at 2:36 pm

Oh darn and how could I forget my favorite Leo/Leonardo and Michelangelo/Angelo!!!!

indiefendi Says:

March 14th, 2014 at 2:41 pm

And Nico too! Haha I’m so forgetful

marypoppins Says:

March 14th, 2014 at 5:32 pm

My favourite O name of all is Oskar!! It wasn’t nearly as popular when we chose it for our son as it sadly is now. I also really love Otto, but my husband had already vetoed that for any future kids. My favourite O name ending in O is Bruno – the verdict is still out on that.

Im-Megan Says:

March 15th, 2014 at 11:35 pm

My sons name is Orson, so I’m particular to that name for a boy. Ialso love Omar 🙂

EloraLaszlo Says:

March 16th, 2014 at 8:15 pm

My two favs are Laszlo and Oscar! I never considered Oz before but I like it, I just need to think of a long name to go with it.

DoctorWho Says:

July 1st, 2014 at 5:36 pm

Boys: Hugo, Leo, Bruno, Cato
Girls: Olive, Juno

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