Last name Cais (Cail 
, Cais 
, Каис 
) , throughout the world, is quite a common surname. The surname Cais is habitual in Czechia, where it is quite a rare surname, Austria, and Philippines. Measured by absolute frequency, it most frequently occurs in Philippines, the United States, and France. Much less frequently, Cais is the forename as well as the last name.
| hippolyte cais de pierlas Italian painter and botanist (1788-1858), FR (b. 1788) |
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jan cais Czech roman catholic priest (1878-1950), CZ (b. 1878) |
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| teodor cais (b. 1891) |
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milan cais Czech drummer, artist and singer, CZ (b. 1974) |
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| oldřich cais CZ (b. 1921) |
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| milan cais Czechoslovakia journalist, CZ (b. 1939) |
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| leszek cais PL (b. 1937) |
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erik cais Czech rally driver and cyclist, CZ (b. 1999) |
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| jiří cais (b. 1952) |
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| cais de pierlas earl |
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| petr cais (b. 1972) |
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| philippe cais |
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| davide cais Italian association football player, IT (b. 1994) |
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