Surname Yastyn (Yastyn 
, Ястин 
) , in the entire world, is a very rare cognomen. The cognomen Yastyn is characteristic of Russia, where it is a very rare surname, and Mexico, where it is an extremely rare surname. Much less frequently, Yastyn is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Yastyn | Mexico |
| Ястин | Russia |