In the world, William Leonidas (William Leonidas 
) is a very rare masculine first name. The given name William Leonidas is characteristic of Latin America and the Caribbean, particularly Peru, where it is a very rare male name. Very seldom, William Leonidas is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| William Leonidas | Peru, Chile, Ecuador, Costa Rica |