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Cat Names That Start With O

By Brynn McKeon · Updated September 2026

Names59

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Total Names59

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About this list

Female cat names that start with O currently in the Top 100 cat names include Olive, Oreo, and Olivia. Cat names currently trending on Nameberry include Ophelia, Ottilie, and Odette. Unique female cat names that start with O include Orla, Ocean, and Olwen.

Male cat names that start with O in the Top 100 cat names include Oliver, Ollie, Oscar, Oreo, Otis, Ozzy, and Onyx. Cat names currently trending on Nameberry include Otto, Orson, and Oakley. Unique cat names that start with O include Oberon, Otter, and Orville.

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The names

Showing 1–20 of 59

Olivia
Latin
"olive tree"
Olivia, a lovely Shakespearean name with an admirable balance of strength and femininity, is one of the top girls' names around the world. 2025 marked its 7th consecutive year in the #1 spot in the…
Oliver
Germanic, Latin
"elf army; ancestor's relic; olive tree"
Oliver is an international star, ranking near the top of the charts throughout the English-speaking world and in a host of European and Latin American countries, from Norway to Chile, Slovenia to…
Oakley
English
"oak wood or clearing"
Oakley, with its nature name roots and its Annie Oakley charm, is a hot name for both genders but more than twice as popular for girls. This name made it into the Top 1000 for the first time in 2013,…
Olive
English, from Latin, nature name
"olive tree"
Though greatly overshadowed by the trendy Olivia, Olive has a quiet, subtle appeal of its own -- and is now enjoying a remarkable comeback. Olive is one of only four girl names starting with O on the…
Oscar
English or Irish
"God spear, or deer-lover or champion warrior"
Oscar is one of the most stylish Old Man Names of our era. While it's softened slightly in popularity over the past 20 years, that may be considered a very good thing. In the nineties and the…
Ophelia
Greek
"help"
Floral, elegant, and bold, Ophelia re-entered the US Top 1000 in 2015 after more than 50 years off the charts. It has risen more than 700 spots since then and shows no signs of slowing down. Now in…
Otto
German
"wealthy"
Otto is cool again. Long a quintessential Old Man Name, Otto has been promoted to trending darling of adventurous baby namers. Like most German names , Otto fell out of favor during and after the two…
Octavia
Latin
"eighth"
Octavia began as the Latin, then Victorian name for an eighth child. While there aren't many eighth children anymore, this ancient Roman name has real possibilities as a substitute for the overused…
Onyx
Word name
"gem stone; claw, nail"
Unlike Pearl and Ruby and more like Jasper, this gem name works well as a boys name. With its strong final X, it feels similar to Alex, Phoenix, Jax, and Rex, while the shiny black quality of the…
Opal
Sanskrit
"gem"
Opal is on the verge of a repolishing, following other jewel names like Ruby and Pearl. A Top 100 name during the first two decades of the twentieth century, the opalescent Opal has a good chance of…
Oakley
English
"oak wood or clearing"
As sturdy as Oak, but with stronger roots as a first name, Oakley ticks lots of boxes for modern trends. With its unisex vibe, its nature-based meaning, its surname-y feel, and its popular -lee…
Ozzy
Pet form of Oswald, Osborn, Osmond or Oscar, English
"divine; deer"
Cute but cool, fresh but familiar, Ozzy was one of the fastest-rising boy names of 2021 and has continued to rise in the US and the UK ever since. While hard-core rocker Ozzy Osbourne might not be…
Otis
Variation of Otto, German
"wealthy"
Otis has real appeal for parents attracted to its catchy O initial and combination of strength and spunk. The appealing hero of the British TV show Sex Education has done much to propel Otis into the…
Ocean
English, nature name
"ocean"
Nature names like Ocean and River are flowing back into favor, especially with nature lovers and green-oriented parents. In 2024, it was given to 483 boys and 325 girls, making this a unisex favorite…
Ocean
English, nature name
Ocean is a nature name that comes right out and states its meaning and association. Full of power and depth, Ocean is one of the fastest-rising baby names for both girls and boys, making the US Top…
Odette
French, from German
"wealthy"
Odette is the good swan in Tchaikovsky's ballet Swan Lake , a role for which Natalie Portman won an Oscar ---and it would make a particularly sophisticated yet upbeat choice. In fact, it charted in…
Ollie
Diminutive of Oliver, Latin
"olive tree"
Ollie is the versatile go-to nickname for the hugely popular Oliver, though the large majority of parents prefer to have the more formal name on the birth certificate. Even in the UK where nickname…
Osiris
Egyptian
"with strong eyesight"
Osiris is the name of Egyptian mythology god-king who died and was reborn every year. Emerging from centuries of obscurity, Osiris has several ingredients for success in the modern world: Roots in…
Odessa
Russian form of Odesa, Ukrainian place-name
"voyage"
Odessa, (transcribed as Odesa in Ukrainian) is a Ukrainian port city and was given its name by Catherine the Great, who was inspired by Homer's Odyssey . It would make an original and intriguing…
Onyx
Word name
"gem stone; claw, nail"
Onyx is a fresh and trending gemstone name for boys, currently in the US Top 500, having climbed the charts rapidly since 2018. Now, an increasing number of girls are receiving the name, with a…

Cat Names That Start With O

About this list

The names

Olivia

Oliver

Oakley

Olive

Oscar

Ophelia

Otto

Octavia

Onyx

Opal

Oakley

Ozzy

Otis

Ocean

Ocean

Odette

Ollie

Osiris

Odessa

Onyx