Miley is of Welsh origin and means 'happy' or 'merry'. It was traditionally used as a nickname for boys, but it has gained popularity as a given name for girls in recent years. The name Miley first appeared on the U.S. Social Security Administration's list of the 1000 most popular girls' names in 2008.
The name Miley experienced a peak in popularity during the mid-1920s with seven births recorded between 1922 and 1928, inclusive. The decade from 1932 to 1942 saw only five births, the lowest point for this name during this period. It regained some traction starting from the late 1940s onwards, with a total of seventy-five births recorded across these years.