Family name Rosnyn (Rosnyn 
) , worldwide, is an extremely rare cognomen. The last name Rosnyn is characteristic of Latin America and the Caribbean, particularly Honduras, where it is a very rare surname, and Venezuela, where it is an extremely rare surname. Also, Rosnyn is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rosnyn | Honduras, Venezuela |