Cognomen Seis (Sis 
, Sais 
, Seis 
) , globally, is a common surname. The last name Seis is characteristic of Guatemala, where it is quite a common surname, Myanmar, and Algeria, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in Guatemala, Myanmar, and Indonesia. Also, Seis is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sis | India, Indonesia, Algeria, Guatemala, Myanmar |
| Sais | India, United States, Indonesia, Algeria, Myanmar |
| Seis | India, United States, Indonesia, Mexico, Guatemala |
| Sayis | India, United States, Malaysia, Mexico, Turkey |
| mathias seis (1783-1854), AT (b. 1783) |
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| eduard seis (b. 1842) |
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| triple seis (b. 1901) |
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maximilian seis French glider pilot, FR |
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| beate seis DE (b. 1962) |
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| william seis Peerage person ID=403306 |
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| cecily seis Peerage person ID=403305 |
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| mark seis American sociologist, US |
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| christian seis Dr. rer. nat. Universität Leipzig 2011, DE (b. 1981) |
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| oliver seis DE (b. 1979) |
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| hermann seis DE |
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| uli seis |
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