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 | Bosnia and Herzegovina, Slovakia, United States, Hungary, Poland |
| Yasko | France, Russia, United Kingdom, United States, Latvia |
| Яско | Kyrgyzstan, Russia, Belarus, Kazakhstan, Ukraine |
| Iasko | Russia, Romania, Georgia, Ukraine, Brazil |
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