Surname Bajer (Bajer 
, Weiher 
, Baaja 
) , in the entire world, is quite a common cognomen. The surname Bajer is characteristic of Czechia, where it is quite a common surname, Poland, where it is quite a rare surname, and Paraguay. Measured by absolute frequency, it is the most numerous in Germany, Poland, and Czechia. Also, Bajer is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Bajer | Germany, Paraguay, Czechia, Poland, United States |
| Weiher | Austria, Germany, Paraguay, Poland, United States |
| Baaja | Morocco, United Kingdom, United States, India, Nigeria |
| Байер | Kazakhstan, Ukraine, Russia, Kyrgyzstan |
| andrzej ignacy bajer (b. 1712) |
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| maciej bajer PL (b. 1730) |
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fredrik bajer Danish politician (1837-1922), DK (b. 1837) |
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matilde bajer Danish women's rights activist and pacifist, DK (b. 1840) |
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michał bajer Polish officer, PL (b. 1884) |
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karol bajer Polish engineer, PL (b. 1889) |
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| karel bajer civil servant at a Ministry of Finance in Prague (1872-1943) (b. 1872) |
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| františek bajer CZ (b. 1867) |
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| elsa bajer holocaust victim, b. 1895-08-19, AT (b. 1895) |
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| jan bajer CZ (b. 1885) |
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| czesław bajer Polish economist (1900-1979), PL (b. 1900) |
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anna bajer Polish actress, PL (b. 1964) |
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petr bajer politician, CZ (b. 1967) |
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| antonín bajer (b. 1911) |
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| antonín bajer (b. 1911) |
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