Last name William Leonidas (William Leonidas 
) , in the world, is an extremely rare cognomen. The surname William Leonidas is characteristic of Latin America and the Caribbean, particularly Chile, where it is an extremely rare surname. Much more frequently, William Leonidas is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| William Leonidas | Peru, Ecuador, Chile, Costa Rica |