Cognomen Riis-Larsen (Riis-Larsen 
) , all around the world, is an extremely rare last name. The family name Riis-Larsen is habitual in Northern Europe, particularly Denmark, where it is a very rare surname. Parts of the name also exists independently as a last name Riis, and a last name Larsen.
| VARIANT | COUNTRY |
|---|---|
| Riis-Larsen | Denmark |