Larkin, ó Lorcáin A Gaelic surname derived from lorc meaning ‘fierce’. A sept of Leinster who were seated in the Barony of Forth in Wexford, until dispossessed by the Normans. A sept of Oriel, who were described at different times as lord of Ui Niallain, Farney, and West Ui Breasail. A sept of the Ui Mhaine in Galway. A sept of Meath who were anciently lords of Caille Follamain. A sept of Tipperary who were erenagh of Lorrha. A sept of the Cineál Eoghain in Donegal. In 1890 Larkin was principally found in Dublin, Armagh, Galway and Tipperary, and the estimated number of bearers was 3,810. In the United States it is the 1,421st most numerous surname with an estimated 24,750 bearers.