Cognomen Russak (Russak 
, Руссак 
) , globally, is a rare family name. The family name Russak is habitual in Estonia, where it is quite a common surname, Poland, where it is a rare surname, and Russia, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in the United States, Estonia, and Russia. Much less frequently, Russak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Russak | Germany, South Africa, Estonia, Poland, United States |
| Руссак | Russia, Ukraine, Belarus |
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marie russak American architect and opera singer, US (b. 1865) |
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| hugo russak (b. 1863) |
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| ben russak playwright, theater director, and publisher, US (b. 1912) |
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| rudolf russak (b. 1902) |
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| harri russak Estonian basketball player, EE (b. 1927) |
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| silvia russak (b. 1930) |
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| viivi russak (b. 1933) |
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| paavo russak Estonian basketballer, EE (b. 1957) |
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| susie russak researcher (ORCID 0000-0001-5037-9854) |
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| al russak college basketball player (1952–1953) Louisville |
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| edward m russak researcher (ORCID 0000-0003-3066-6957) |
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| ira bert russak Ph.D. University of California, Los Angeles 1967 |
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| sergei russak (b. 1996) |
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