Last name Birnbach (Birnbach 
) , globally, is a rare cognomen. The family name Birnbach is characteristic of Poland, where it is a rare surname, Germany, and Israel. In absolute terms, this name is the most popular in Germany, Poland, and the United States. Much less frequently, Birnbach is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Birnbach | Germany, Israel, United States, Poland, Argentina |
| carl joseph birnbach (b. 1751) |
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| heinrich august birnbach PL (b. 1782) |
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| henri birnbach PL (b. 1793) |
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| werner birnbach German judge, Federal Court of Justice (1890-1975), DE (b. 1890) |
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| berthold birnbach holocaust victim, b. 1903-04-20, CZ (b. 1903) |
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| rudolf birnbach (b. 1895) |
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| nathan birnbach holocaust victim, b. 1907-10-04, CZ (b. 1907) |
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| stefan birnbach PL (b. 1909) |
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| lawrence birnbach (b. 1944) |
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| lisa birnbach American writer, US (b. 1957) |
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| ron birnbach |
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| matthias birnbach AT (b. 1998) |
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