Surname Ευστράτιος (Efstratios 
, Istrati 
, Eustratios 
) , all over the world, is a common cognomen. The surname Ευστράτιος is characteristic of Greece, where it is a common surname, Moldova, where it is quite a common surname, and Romania, where it is quite a rare surname. Also, Ευστράτιος is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Efstratios | Bosnia and Herzegovina, Germany, Greece, South Africa, United States |
| Istrati | Mali, Romania, Moldova, United States, Italy |
| Eustratios | Germany, United Kingdom, South Africa, Greece, United States |
Evstratios, and Евстратий
| λεόντιος ευστράτιος CY |
|