is callahan an irish name
Callahan Name History Callahan is a well-known Irish surname. The Callahan name means descendent of CeallachÃ¡n. He was the EÃ³ganachta King of Munster from AD 935 until 954. The personal name Cellach means 'bright-headed.' These Irish counties claim Callahans: Armagh, Louth, Meath, and Monaghan.