'''O'Callaghan or simply Callaghan' without the prefix (anglicized from two separate surnames and clans, Ó Ceallacháin, Munster Clan. Ó Ceileacháin, Oriel Clan)'' is an Irish surname.
'''O'Callaghan or simply Callaghan' without the prefix (anglicized from two separate surnames and clans, Ó Ceallacháin, Munster Clan. Ó Ceileacháin, Oriel Clan)'' is an Irish surname.
==Origin and meaning== ===Munster===
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).