Cognomen Sais (Sais 
, Size , Seis 
) , around the globe, is quite a common last name. The last name Sais is characteristic of Botswana, where it is quite a rare surname, Algeria, and Zimbabwe. In absolute terms, it most frequently occurs in the United States, Algeria, and Mexico. Also, Sais is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Size, Sais | Spain, Mexico, United States, Algeria, Germany |
| Seis | Spain, Brazil, Mexico, United States, Germany |
| Саис | Kazakhstan |
| elidir sais Welsh poet (b. 1190) |
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trinitat sais i plaja Spanish physician (1878-1933), ES (b. 1878) |
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tatjana sais actress (1910-1981), DE (b. 1910) |
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manuel torras sais Spanish seminarian, ES (b. 1915) |
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| juan puig-sureda y sais ES (b. 1881) |
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| maria perpinyà i sais Spanish writer (1901-1994), ES (b. 1901) |
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daniel sais Argentinian musician, AR (b. 1962) |
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| enric argelich i sais Spanish composer (1913-1979), ES (b. 1913) |
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| lluís sais puigdemont Spanish politician, ES (b. 1966) |
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| thomas ap llewellyn ap howell ap eynon sais Peerage person ID=471589 |
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| gregory sais Welsh soldier |
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| sonchis of sais 6th century BC Egyptian priest |
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| emma sais researcher |
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| llywelyn ap hywel fychan ap hywel ab einion sais (1330-1412) |
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| jordi sais giralt ES (b. 1973) |
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