The Irish surname Callaghan is derived from the Gaelic name Ó Ceallacháinmeaning “descendant of Ceallachán,” a diminutive of the personal name Ceallach, meaning “bright-headed, or blonde haired,” from cen meaning “head’ and lach meaning “light.” This name was borne by a 10th-century king of Munster, from whom many present-day bearers of the surname claim descent. County Cork is where most bearers of the name tarce their ancestry to.The first recorded spelling of the family name is shown to be that of John O' Callaghan which was dated 1605, in the birth records of County Cork. Today there are approximately 5,800 people with the family name Callaghan living in The United States.
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