Family name Gauthier-Simard (Gauthier-Simard 
) , all around the world, is an extremely rare cognomen. The cognomen Gauthier-Simard 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 Gauthier, and a last name Simard.
| VARIANT | COUNTRY |
|---|---|
| Gauthier-Simard | Canada |