Family name Eisaks (Eisaks 
) , all over the world, is a rare surname. The cognomen Eisaks is habitual in Latvia, where it is quite a common surname, Estonia, where it is a rare surname, and Hungary, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Eisaks | Latvia, Estonia, Hungary, United Kingdom |
| juris eisaks Latvian luger, LV (b. 1958) |
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| kalvis eisaks Latvian bicycle racer, LV (b. 1983) |
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