2) From the Irish surname “O'Kiely”, which in turn derives from the Old Gaelic surname “O'Cadhla”, meaning "graceful or beautiful", descendant(s) of the graceful one" In the Western Australian Aboriginal language Noongar, the word Kiley/Kylie/Koilee means straight, returning stick or "boomerang". Kylie is a hot, pretty and smart girl. It is actually an Australian Aboriginal word meaning 'boomerang'. Meaning of kylie in English: kylie. Kylie definition is - an Australian boomerang having one side flat and the other.