Irish Boy Names O to Z

No. 93 for boys in Ireland in 2025, with 63 baby boys. Odhran means “dark-haired.”

Odran in Irish is Odhran, meaning “dark-haired.” Not in Ireland's 2025 tables (fewer than three babies); last recorded in 1974.

No. 5 for boys in Ireland in 2025, with 331 baby boys. Oisin means “little deer.”

Owen in Irish is Eoghan, meaning “born of the yew tree.” No. 317 for boys in Ireland in 2025, with 13 baby boys.

No. 185 for boys in Ireland in 2025, with 26 baby boys. Padraig means “nobly born.”

No. 12 for boys in Ireland in 2025, with 239 baby boys. Paidi means “nobly born.”

Patrick in Irish is Padraig, meaning “nobly born.” No. 25 for boys in Ireland in 2025, with 183 baby boys.

No. 232 for boys in Ireland in 2025, with 20 baby boys. Peadar means “the rock.”

No. 509 for boys in Ireland in 2025, with 6 baby boys. Pearse comes from the Norman French name Piers and honours Patrick Pearse, a leader of the 1916 Easter Rising.

Peter in Irish is Peadar, meaning “the rock.” No. 152 for boys in Ireland in 2025, with 34 baby boys.

Phelan in Irish is Faolan, meaning “wolf.” Rare in Ireland: fewer than three baby boys a year get the name.

Phelim in Irish is Feidhelm, meaning “ever good.” Not in Ireland's 2025 tables (fewer than three babies); last recorded in 2015.

Not in Ireland's 2025 tables (fewer than three babies); last recorded in 1982. Proinsias means “little Frenchman.”

Rare in Ireland: fewer than three baby boys a year get the name. Quinlan means “gracefully shaped.”

No. 676 for boys in Ireland in 2025, with 4 baby boys. Quinn means “intelligent.”

Raymond in Irish is Redmond, meaning “counsellor, protector.” No. 509 for boys in Ireland in 2025, with 6 baby boys.

Not in Ireland's 2025 tables (fewer than three babies); last recorded in 2018. Redmond means “counsellor, protector.”

Not in Ireland's 2025 tables (fewer than three babies); last recorded in 2023. Reilly comes from the Irish surname Ó Raghallaigh, “descendant of Raghallach.”

No. 1 for boys in Ireland in 2025, with 490 baby boys. Rían is an old Irish boy’s name of uncertain meaning, traditionally said to mean “little king.”

Rare in Ireland: fewer than three baby boys a year get the name. Riordan means “royal poet.”

No. 86 for boys in Ireland in 2025, with 67 baby boys. Ronan means “seal.”

No. 120 for boys in Ireland in 2025, with 46 baby boys. Ruadhan means “little red one.”

No. 67 for boys in Ireland in 2025, with 85 baby boys. Ruari means “red king.”

No. 147 for boys in Ireland in 2025, with 36 baby boys. Seamus is the Irish form of James.

No. 23 for boys in Ireland in 2025, with 185 baby boys. Sean means “God's gracious gift.”

No. 38 for boys in Ireland in 2025, with 126 baby boys. Senan means “little old or wise one.”

Shane in Irish is Sean, meaning “God's gracious gift.” No. 152 for boys in Ireland in 2025, with 34 baby boys.

Shaun in Irish is Sean, meaning “God's gracious gift.” No. 577 for boys in Ireland in 2025, with 5 baby boys.

Shawn in Irish is Sean, meaning “God's gracious gift.” Not in Ireland's 2025 tables (fewer than three babies); last recorded in 2012.

No. 8 for boys in Ireland in 2025, with 286 baby boys. Tadhg means “poet, philosopher.”

Terence in Irish is Turlough, meaning “one who aids.” No. 577 for boys in Ireland in 2025, with 5 baby boys.

Terry in Irish is Turlough, meaning “one who aids.” No. 509 for boys in Ireland in 2025, with 6 baby boys.

Thomas in Irish is Tomas, meaning “twin.” No. 16 for boys in Ireland in 2025, with 211 baby boys.

No. 252 for boys in Ireland in 2025, with 18 baby boys. Tiarnan means “little lord.”

Rare in Ireland: fewer than three baby boys a year get the name. Tierney means “lord, chief.”

Timothy in Irish is Tadhg, meaning “poet, philosopher.” No. 329 for boys in Ireland in 2025, with 12 baby boys.

No. 95 for boys in Ireland in 2025, with 60 baby boys. Tomas means “twin.”

No. 829 for boys in Ireland in 2025, with 3 baby boys. Turlough means “one who aids.”

No. 829 for boys in Ireland in 2025, with 3 baby boys. Ultan means “an Ulsterman.”

William in Irish is Liam, meaning “strong protector.” No. 73 for boys in Ireland in 2025, with 81 baby boys.