Cognomen Flatsousis (Flatsousis 
) , in the entire world, is a very rare last name. The family name Flatsousis is characteristic of Greece, where it is a rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Flatsousis | Greece, United States |
| pantelis flatsousis Greek director |
|