Kaelie is an attractive Irish girl's name derived from the surname O'Caoilfheartaigh, meaning "descendant of Caoilfheartaigh," which translates to "slender" or "slim" and "swift." It originated as a Celtic tribal surname around 500 BC before evolving into a given name, symbolizing strength and swiftness. Today, Kaelie remains popular for its distinctive sound, Irish roots, and meaningful significance.