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Dog Names That Start With O

By Brynn McKeon · Updated September 2026

Names150

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Total Names150

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About this list

Female dog names that start with O currently in the Top 100 dog names include Olive and Oakley. Dog names currently trending on Nameberry include Ophelia, Ottilie, and Olivia. Unique female dog names that start with O include Orla, Ocean, and Oona.

Male dog names that start with O in the Top 100 dog names include Oliver, Ollie, Otis, Oscar, Oreo, Odin, Oakley, and Ozzy. Dog names currently trending on Nameberry include Otto, Owen, and Orion. Unique male dog names that start with O include Orson, Olaf, and Odyssey.

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The names

Showing 1–20 of 150

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…
Owen
Welsh
"young warrior; well-born"
Owen, a resonant Celtic name, has ranked among the Top 100 boys' names in the US for 20 years and is now trending ever-so-slightly downhill, good news for Owen-lovers who might rightly have feared…
Oaklynn
American invented name
"oak lake"
Many names relating to oak as in the tree are becoming more popular for baby girls, including Oaklynn, more popular than twin Oaklyn three to one. About 1800 baby girls were named Oaklynn versus 600…
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…
Omar
Arabic, Hebrew
"flourishing, thriving; eloquent"
A multicultural choice with an appealing open O sound, Omar blends stately strength with familiarity. Also transcribed as Umar, it is a popular choice among Muslim families and features in the name…
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…
Orion
Greek
"boundary, limit"
Orion is a rising star, with both mythical and celestial overtones. The Greek mythological Orion was the legendary hunter who pursued the seven daughters of Atlas, was slain by the goddess Artemis,…
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…
Odin
Variation of Óðinn, Old Norse
"god of frenzy; poetic fury"
Odin is the name of the supreme Norse god of art, culture, wisdom, and law — who was handsome, charming, and eloquent into the bargain. The name projects a good measure of strength and power and has…
Oaklee
Variation of Oakley, English
"oak clearing"
Oakley is one of the truest unisex names for babies, achieving a 56-44 gender distribution, favoring girls. Oaklee is 80% female and may serve as a clearer identification of sex, if that’s what…
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…
Oaklyn
American invented name
"oak lake"
Oaklyn is one of the oak-related names moving up the popularity charts, along with more popular sister Oakley and near-identical twin Oaklynn. The Oaklynn spelling used for three times as many baby…
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…

Dog Names That Start With O

About this list

The names

Olivia

Oliver

Owen

Oaklynn

Oakley

Olive

Oscar

Omar

Ophelia

Otto

Octavia

Orion

Onyx

Opal

Oakley

Odin

Oaklee

Ozzy

Oaklyn

Otis