Mackenzie is a Scottish surname from the Gaelic Mac Coinnich and means "son of Coinneach", a name usually explained as "handsome" or "comely". The actress Mackenzie Phillips of the 1970s sitcom One Day at a Time helped turn the surname into a girls' name in the United States. Mackenzie was number 43 among US girls' names in 2000 and peaked at number 40 the next year; it stayed in the top 100 until 2017 and ranks number 228 in 2025.