Family name Leblanc-Mongeon (Leblanc-Mongeon 
) , throughout the world, is an extremely rare surname. The family name Leblanc-Mongeon is characteristic of Northern America, particularly Canada, where it is an extremely rare surname. Parts of the name also exists independently as a last name Leblanc, and a last name Mongeon.
| VARIANT | COUNTRY |
|---|---|
| Leblanc-Mongeon | Canada |