Charlie, a diminutive of Charles, comes from the Germanic name Karl, which is derived from a Germanic word meaning "man" or "free man." Originally a top-100 boy's name every year between 1900 and 1935, Charlie has since grown more popular among baby girls and has been a top-150 girl's name in the U.S. every year since 2019. While it hasn't been a top-150 boy's name for any year since 1949, it does happen to be the name "Jane the Virgin" star Gina Rodriguez chose for her son, Charlie Ray. It's also the nickname "Laguna Beach" star Lauren Conrad uses for her son, Charles Wolf.
