Cognomen Ryum (Ryum 
) , throughout the world, is a very rare last name. The last name Ryum is characteristic of Norway, where it is a rare surname, and the United States, where it is an extremely rare surname. Likewise, Ryum is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ryum | India, China, Norway, United States |
|
nils ryum (b. 1936) |
|
| ulla ryum Danish writer (b. 1937) |
|