Kiley is an American spelling of Kylie, which is usually traced to an Aboriginal Australian word for "boomerang" and also serves as a feminine form of Kyle, meaning "narrow strait". It can additionally be read as a respelling of the Irish surname Keeley. Kiley ranked 451 among US girls in 2000, peaked at number 307 in 2008, left the top 1000 in the late 2010s and stands at number 2798 in 2025.