Surname Costis (Κωνσταντίνος 
, Константинос 
, Костас 
, among others...) , globally, is a rare family name. The surname Costis is characteristic of Greece, where it is a rare surname, Bulgaria, and Romania. In absolute terms, it most frequently occurs in Romania, France, and Greece. More frequently, Costis is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Κωστής, Κωνσταντίνος | Greece |
| Константинос | Russia, Ukraine, Bulgaria |
| Костас | Russia, Belarus, Bulgaria, Ukraine, Lithuania |
| Costis | Romania, United Kingdom, United States, Greece, France |
Constantios, Costakis, Costantinos, Costas, Cottas, Dinos, Konstantinos, Konstantios, Konstantis, Konstantínos, Kostakis, Kostas, Kostis, Kosztasz, Kottas, Kóstas, Ntinos, Takis, Κωνσταντής, Κωστάκης, Κώστας, Ντίνος, Τάκης, Константий, Константінос, Констанций, Цостис, קונסטנטין, and قسطنطين