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Family name Joniskis (Joniskis
) , throughout the world, is a rare last name. The surname Joniskis is habitual in Northern Europe, particularly Lithuania, where it is quite a rare surname, Latvia, where it is a rare surname, and Estonia. Measured by absolute frequency, the name is most common in Northern Europe, particularly Lithuania, Latvia, and Denmark.
| VARIANT | COUNTRY |
|---|---|
| Joniskis | Latvia, Lithuania, Denmark, Estonia |