Family name Gregin (Gregin 
) , in the entire world, is a very rare cognomen. The surname Gregin is habitual in Croatia, where it is a very rare surname, and the United States, where it is an extremely rare surname. Likewise, Gregin is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gregin | South Africa, Philippines, Croatia, United States, India |