Callahan Family History
Callahan Name Meaning
Irish (Munster): shortened Anglicized form of Gaelic Ó Ceallacháin ‘descendant of Ceallachán’ a diminutive of the personal name Ceallach probably meaning ‘bright-headed’ from cen ‘head’ + lach ‘light’. This name was borne by a 10th-century king of Munster from whom many present-day bearers of the surname claim descent.
Source: Dictionary of American Family Names 2nd edition, 2022