Oisin is a masculine name of Irish Gaelic origin, derived from the word oisín, meaning “little deer,” and historically borne by the poet-warrior son of Fionn mac Cumhaill in Irish legend. Pronounced uh-SHEEN (/əˈʃiːn/) in both Irish and English contexts, it retains a consistent phonetic profile. Analysis of U.S. Social Security data from 1991 through 2024 indicates that Oisin has occupied a steady niche in the national rankings—fluctuating between the 700- and 900-position band—with 26 newborns given the name in 2024 (rank 898) and a peak of 31 in 2020 (rank 887). This measured yet persistent usage suggests that Oisin appeals to parents seeking a name with clear pronunciation, Celtic heritage, and a direct link to Ireland’s mythological tradition.
| Oisin Murphy is an Irish jockey known for winning two British Classics and five British Champion Jockey titles. |
| Oisín McGann - Oisin McGann is an Irish writer and illustrator known for science fiction and fantasy books for children and teenagers. |
| Oisín Mullin - Oisin Mullin is an Irish footballer who plays for Geelong in the AFL after previously playing Gaelic football for Kilmaine and Mayo. |
| Oisín McConville - Oisin McConville is an Irish Gaelic football manager and former Armagh player who won an All-Ireland title and two All Stars. |
| Oisín Quinn - Oisin Quinn is an Irish High Court judge and former Lord Mayor of Dublin. |