Callahan is a boy's name of Irish origin which means "bright-headed." It is a derivative of the Gaelic surname Ó Ceallacháin and may also be spelled as Callaghan. In the 10th century, Ó Ceallacháin was the king of Munster province in Ireland. If you want to honor your ancestral heritage or give baby a name fit for a king, Callahan is a noteworthy contender.
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