Family name Яско (Jasko 
, Yasko 
, Яско 
) , in all the world, is quite a rare last name. The family name Яско is characteristic of Slovakia, where it is quite a rare surname, Latvia, and Bosnia and Herzegovina. Not in comparison with a country's population, it is the most numerous in the United States, Poland, and Russia. Likewise, Яско is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Jasko | Hungary, Poland, Bosnia and Herzegovina, United States, Slovakia |
| Yasko | United Kingdom, Latvia, United States, Russia, France |
| Яско | Kazakhstan, Ukraine, Belarus, Kyrgyzstan, Russia |
| Iasko | Ukraine, Brazil, Georgia, Romania, Russia |
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