Family name Koulatsos (Koulatsos 
) , in the entire world, is a very rare last name. The last name Koulatsos is habitual in Greece, where it is a rare surname, New Zealand, where it is a very rare surname, and Australia. Not in comparison with a country's population, it is the most numerous in Greece, the United States, and Australia.
| VARIANT | COUNTRY |
|---|---|
| Koulatsos | United States, Greece, Australia, New Zealand |