Cahill is another Irish surname that has found use as a first name. It comes from the Gaelic “Ó Cathail,” meaning “descendant of Cathal.” Cathal itself means “battle-mighty” or “strong in battle.”

Origin: Irish Gaelic
Meaning: Descendant of Cathal (strong in battle)
Popularity: More common as a surname, but growing in use as a first name
Inspiration: Cahill evokes images of warriors and strength. Notable Cahills include Australian soccer player Tim Cahill and Irish historian Thomas Cahill.