Boys' names starting with O
81 names, most popular first. Numbers are babies registered in Ireland (CSO).
Given in 2025
Earlier names
Given to at least 3 babies in some year since 1964, but not in 2025.
- Olaf
- Omer
- Oskaras
- Olivers
- Olamide
- Oluwatobi
- Oluwaseun
- Odran
- Oliwer
- Oluwatobiloba
- Oren
- Orlando
- Oluwatosin
- Orrin
- Oskars
- Orson
- Obinna
- Oluwaferanmi
- Oluwapelumi
- Osgar
- Obed
- Olasubomi
- Oluwatamilore
- Ondrej
- Odhean
- Odinn
- Oilibhéar
- Oissine
- Ojas
- Oktawian
- Olalekan
- Olanrewaju
- Olaoluwa
- Oleg
- Olin
- Olufemi
- Olumide
- Oluwa
- Oluwadamilare
- Oluwadamilola
- Oluwafemi
- Oluwamayowa
- Oluwasegun
- Oluwaseyi
- Oluwasijibomi
- Oluwatimilehin
- Oluwatimileyin
- Oluwatomiwa
- Onyekachi
- Orann
- Oreoluwa
- Orest
- Orestas
- Orran
- Orry
- Osama