From Irish Ó Ceallacháin, from Ceallachán, diminutive of the given name Ceallach.
"callahan." YourDictionary, n.d. Web. 15 January 2019. <https://www.yourdictionary.com/callahan>.
callahan. (n.d.). Retrieved January 15th, 2019, from https://www.yourdictionary.com/callahan
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