Family name Thorn-Monroe (Thorn-Monroe 
) , around the globe, is an extremely rare cognomen. The last name Thorn-Monroe is characteristic of Northern America, particularly the United States, where it is an extremely rare surname. Parts of the name also exists independently as a last name Thorn, and a last name Monroe.
| VARIANT | COUNTRY |
|---|---|
| Thorn-Monroe | United States |