Originally an Anglicized form of the ancient Irish male name Ceallach. It is now very widely used in the English-speaking world, mainly as a girl's name. This is a transferred use of the surname Ó Ceallaigh ‘descendant of Ceallach’.
Southern French and Catalan (Cabañ, Caban): possibly from Occitan caban, gaban ‘coat wth large sleeves’, applied as an occupational nickname for a Provençal farmer, or perhaps a topographic name, from a masculine form of cabana, cabanya ‘cabin’, ‘hut’ (Late Latin capanna). The form Cabañ would be the Castilianized form of Cabany.