Surname Sisask (Sisask 
) , worldwide, is a rare family name. The cognomen Sisask is characteristic of Northern Europe, particularly Estonia, where it is quite a common surname, Sweden, where it is a rare surname, and Finland. Measured by absolute frequency, the name is most common in Estonia, Sweden, and Spain.
| VARIANT | COUNTRY |
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| Sisask | Sweden, United Kingdom, Spain, Estonia, Finland |
| peeter sisask (b. 1885) |
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urmas sisask Estonian composer, EE (b. 1960) |
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kaia sisask Estonian translator, editor, EE (b. 1967) |
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| richard sisask (b. 1909) |
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| heino sisask Estonian politician and athletics competitor, EE (b. 1928) |
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merike sisask researcher, EE |
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| rudolf sisask (b. 1926) |
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| helli sisask EE (b. 1945) |
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| olof per ale sisask Ph.D. University of Bristol 2009 |
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| valeria sisask |
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