Irish Boy Names Starting with O

4 Irish boy names beginning with O, with what each one means and how to say it.

Updated September 2026

There are 4 Irish boy names starting with O here. The ones readers look up most are Oisin, Owen and Odhran.

Irish boy names starting with O

O-ran

Odhran means “dark-haired.” Two syllables, stress on the first.

Odran in Irish is Odhran, meaning “dark-haired.” Say it O-ran.

osh-EEN

Oisin means “little deer.” Two syllables, stress on the second.

Owen in Irish is Eoghan, meaning “born of the yew tree.” Say it O-in.