Irish Names that Start With O

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.

Oona is a name made famous by Eugene O'Neill's daughter, who became Charlie Chaplin's wife. One of the original Oona's granddaughters was named after her, and is now an actress famous in her own right for playing Talisa of Volantis in HBO's "Game of Thrones." The double-o beginning gives their name a lot of oomph.

Orla is an Irish name closely associated with the high king Brian Boru, as it was the name of his sister, daughter and niece. It was very popular in the Middle Ages – the fourth most popular name in twelfth century Ireland – and has become popular again in Ireland, Scotland, England and Wales today. In Irish, the name is commonly spelled Orlaith or Orlagh.

A calm and gentle multicultural choice. Oran is popular in Ireland, where its Gaelic form is Odhrán, meaning "little green one". In Scottish Gaelic, the name means "song", and in Hebrew, it's a combination of Or "light" + Ran "singing".

Orin is one of a variety of similarly-spelled names that have a soft and sensitive image. The Orrin spelling has been known nationally via Republican Senator Hatch.

Oisin is one of the most popular Irish baby names in its native land, though largely unknown in the US. The original Oisin was the mythological son of Finn McCool and Sadb, the goddess who was changed into a deer. A legendary war hero and poet, Oisin had a name that is also reminiscent in sound of the ocean. Pronounced correctly, this name has an attractive sheen.

Odhran, Anglicized as Oran, was the name of an ancient saint. Today, Odhran is among the Top 100 Irish names for boys in Ireland.

This Irish saint's name sounds like a lopped-off Lorna.

Oengus is the old Irish form of the name most commonly found in the modern world as Angus, typically Scottish.
In Irish mythology, Oengus is the god of youth, love, and poetry.

Perfect name for the child of dog enthusiasts, and much more distinctive than the trendy Connor.

The use of O-prefixes could create the next wave of Irish-inflected names, offering an innovative way of honoring a relative with the old-fashioned moniker Brian. On Downton Abbey, the surname O'Brien was heard so often, it began to seem like a first.

The O'Haras are descended from Eaghra -- pronounced and phonetically spelled Ara -- the lord of Luighne, the modern Leyney in County Sligo. As a name, this makes a satisfying new twist on Harry.

Irish surname that refers to High King Brian Boru, also spelled O'Brien. Makes a fabulous first name.

Perfect as an updated namesake for Great-Uncle Neal (or Neil).

Donovan is on the rise, so why not this sequel?

This kind of authentic Irish surname makes a memorable first name for either sex, following in the path of all the Mac and Mc names recently popular.

The use of O-prefixes could create the next wave of Irish inflected names, offering an innovative way of honoring a relative with a behind the times moniker.

If you love the venerable Southwestern painter but feel Georgia's gotten too overheated, you might want to go all the way to this Irish surname in the fashionable O' family.

Fallon has gone feminine, but this puts it back in the boys' camp.

One of the most usable of the fashionable O'Names.