Family name Klas (Klas 
, كلاس 
, Клас 
) , in all the world, is quite a common surname. The cognomen Klas is characteristic of Suriname, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Czechia. Not in comparison with a country's population, it is commonest in Germany, Syria, and Czechia. Also, Klas is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Klas | Germany, Sweden, Morocco, Czechia, Poland |
| كلاس | Egypt, Syria, Sudan, Morocco, Saudi Arabia |
| Клас | Ukraine, Russia, Kyrgyzstan, Kazakhstan |
| 克拉斯 | China |
| samuel klas holocaust victim, b. 1870-02-09, DE (b. 1870) |
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| edvard klas CZ (b. 1878) |
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eri klas Estonian conductor, EE (b. 1939) |
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| karel klas Czechoslovak member of Czechoslovak parliament, member of Czechoslovak national parliament and Czechoslovak politician (b. 1902) |
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jan klas Czech aviation expert and manager, CZ (b. 1963) |
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| peter klas SK (b. 1904) |
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rinaldo klas (b. 1954) |
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| alfredo bertoldo klas Brazilian writer (1915-2013), BR (b. 1915) |
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| josef klas Surinamese sculptor and painter, SR (b. 1923) |
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| jan vlastimil klas CZ (b. 1924) |
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| anton klas (b. 1927) |
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| aleksandar klas (b. 1928) |
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| teofil klas Slovak poet, translator and writer, SK (b. 1940) |
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| jan klas Czech politician, CZ (b. 1958) |
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| mojmír klas CZ (b. 1952) |
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