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'.
The Callahan surname is particularly associated with County Cork in Ireland, where the Callahan clan held significant territory. Interestingly, the name has spread globally through Irish diaspora, becoming common in America where it's often associated with working-class Irish-American families.
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