The name Leo is a boy's name of German, Latin origin meaning "lion". Leo was derived from the Latin leo, meaning “lion.” Thirteen popes have carried the name, including St. Leo the Great. In Germanic languages, Leo has historically been used as a nickname for names including Leon and Leopold. In Latinate languages, Leonardo is considered a full form for Leo. Leo is a strong-yet-friendly name that was common among the Romans, used for thirteen popes, and is now on the upswing partly thanks to Leonardo "Leo" DiCaprio. Penelope Cruz and Javier Bardem called their son Leo, as did actress Kim Raver, NASCAR driver Jeff Gordon and Kristin Olson. It's on the rise and more popular than it's been at any point since FDR's first term in office. Leo has a lot of elements going for it: its leonine associations suggest strength of character and physique, its zodiac reference appeals to New Agers, and its 'o' ending gives it added energy. Famous Leos of the past include Pope Leo the Great and twelve other popes, a number of early saints, and Leo Tolstoy, as well as Dead End Kid Gorcey, colorful baseball manager Durocher, influential gallerist Castelli and the leonine MGM icon. There have been Leos seen on everything from The West Wing to Charmed to Grey's Anatomy to Seinfeld" Leo is on an international roll—it is currently very popular in France (where it's pronounced LAY-o), in Finland, and in England and Wales, Scotland and Sweden.