Callahan

/ˈkæləhæn/ noun

An Irish surname meaning 'descendant of Ceallachán', often referring to people bearing this family name.

From Irish Gaelic Ó Ceallacháin, meaning 'descendant of Ceallachán'. The personal name Ceallachán derives from 'ceallach' meaning 'war' or 'strife', combined with the diminutive suffix '-án'.

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