Family name Leoncio Fabian (Leoncio Fabian 
) , all around the world, is an extremely rare cognomen. The surname Leoncio Fabian is characteristic of Latin America and the Caribbean, particularly Chile, where it is an extremely rare surname. More prevalently, Leoncio Fabian is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Leoncio Fabian | Costa Rica, Chile, Peru, Ecuador |