Throughout the world, Leblanc-Mongeon (Leblanc-Mongeon 
) is an extremely rare unknown gender first name. Much more prevalently, Leblanc-Mongeon is the last name as well as the forename. Parts of the name also exists independently as a last name Leblanc, and a last name Mongeon.
| VARIANT | COUNTRY |
|---|---|
| Leblanc-Mongeon | Canada |