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Cognomen Iason (Iason
, Ясон
, Иасон
) , throughout the world, is quite a rare last name. The cognomen Iason is characteristic of Georgia, where it is quite a common surname, Greece, and Cyprus, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Greece, Georgia, and Bulgaria. Likewise, Iason is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Iason | United States, Georgia, Greece, Austria, Bulgaria |
| Ясон | Ukraine, Kazakhstan, Armenia, Russia, Bulgaria |
| Иасон | Russia |
| Ιάσων | Greece |