Last name Róin (Ройн 
, Róin 
) , in the world, is a very rare cognomen. The cognomen Róin is characteristic of Northern Europe, particularly Denmark, where it is a rare surname. Much less frequently, Róin is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ройн | Russia, Ukraine |
| Róin | Denmark |
| ása róin researcher |
|
|
| ailill mac áedo róin King of the Uí Failge |
|
|
| áed róin King of Ulster |
|
|
| fiachnae mac áedo róin Irish king |
|
|
| bressal mac áedo róin Dál Fiatach king of Ulaid |
|
|
| tóra róin researcher (ORCID 0000-0002-9970-4491) |
|
|
| erla kallsoy róin (b. 1990) |
|