Last name Giolláin (Giolláin 
) , around the world, is a very rare family name. The family name Giolláin is characteristic of Northern Europe, particularly Ireland, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Giolláin | Ireland |
| aron ó giolláin Irish hurler, IE (b. 1996) |
|