Cahill (locally /ˈkɑːhɪl/, UK: /ˈkɑːhɪl/ or /ˈkeɪhɪl/) is a name of Irish origin.
It is the anglicised version of the Gaelic "Ó Cathail" meaning "descendant of Cathal".
"Cathal" consists of two parts: "cath" means battle; the second could be "val" (rule), so that the name as a whole meant "battle ruler" or "strong in battle",[1][2][3] or it could be "all" (great), so that the name as a whole meant "great warrior".
[4][5] Notable people with the surname include: