Bright-headed or little church
Kallahan is a modern variant of the Irish surname Callahan, which derives from the Gaelic name Ceallachán. The root 'ceall' can refer to a church or strife, while the diminutive suffix suggests 'little.' It is often interpreted as 'bright-headed' in reference to the original bearer's appearance.
Less common today
Kallahan isn't in the latest US Top 1000. It last peaked at #3,180 in 2025.
US births per 5-year period, 1990–present (SSA data).
