From Ó hÓgáin, ‘the young one’ — a Tipperary and Clare sept who served for generations as marshals to the O'Briens of Thomond.
Gaelic Origin · Root meaning ‘young one’
Hogan comes from óg (‘young’), read as ‘the young one’ — most likely an old personal name rather than a literal description. The Ó hÓgáin held territory in Ara, County Tipperary, and served for generations as hereditary marshals to the O'Briens of Thomond, commanding their forces in battle.
A name meaning ‘young’ attached to a family whose job was leading Thomond's soldiers — proof that a founder's name doesn't always predict a family's trade.
Irish form: Ó hÓgáin