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Nicknames for Leo

No nickname needed! (It only has three letters)
But can be a nickname for Leonard, Leonardo, etc.

Meanings and history of the name Leo

Leo comes from the Latin word for lion.

So that's where Leo the Lion comes from?

Famous real-life people named Leo

Leo Baekeland, Belgian chemist whose inventions ushered in the Age of Plastics
Leo Burnett, American advertising executive (created Tony the Tiger, the Pillsbury Doughboy, and many ad icons)
Leo Szilard, Hungarian-American physicist who conceived the nuclear chain reaction and worked on the Manhattan Project
Leo Tolstoy, Russian novelist (War and Peace)
Leo Lionni, children's book author and illustrator (Frederick, Swimmy, etc)
Thirteen Roman Catholic popes have borne the name Leo including St. Leo the Great.
Leo G. Carroll, English born actor well known for his roles in numerous Hitchcock films
Leonardo "Leo" DiCaprio the actor "Titanic"
Leo Ryan, U.S. Congressman killed at Jonestown, Guyana trying to rescue victims of Jim Jones
Leo Kipling Boyer (b. 2007), son of American actress Kim Raver
Leo Benjamin Gordon (b. 2010), son of American former professional stock car racing driver Jeff Gordon
Leo Encinas Cruz (b. 2011), son of Spanish actress and model Penélope Cruz and Spanish actor Javier Bardem
Leo Grey McElhenney (b. 2012), son of American actress, model, and comedian Kaitlin Olson and American actor, director, producer, and screenwriter Rob McElhenney
Leo James Routh (b. 2012), son of American actress Courtney Ford and American actor Brandon Routh
Leo Jung, South Korean main vocalist of South Korean pop boy group VIXX

Leo in song, story & screen

Leo Valdez, son of Hephaestus in Rick Riordan's Heroes of Olympus series.
Leo McGarry, chief of staff/vice presidential candidate in the television series The West Wing.
Leo Bloom, accountant in The Producers of screen and stage
Leo Dooley, Disney's Lab Rats
Leonardo (nickname: Leo), main character in the "Teenage Mutant Ninja Turtles" series