English, German, and Polish form of Leo. First influenced during the early 20th century by Leon Trotsky, the Russian Communist revolutionary. Film and television actor Leon Ames brought attention to the name during the 1940s and 1950s. He was also one of the founding members of the Screen Actors Guild. In continuous use in the U.S., but losing ground during the past 20 years. Popular in Austria, England, Ireland, Scotland, Switzerland, and Wales. A chart-topper in Germany.