Last name Zwölfer (Zwölfer 
) , in all the world, is a rare surname. The surname Zwölfer is characteristic of Western Europe, particularly Austria, where it is a rare surname, and Germany.
| VARIANT | COUNTRY |
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| Zwölfer | Germany, Austria |
| theodor zwölfer RO (b. 1895) |
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| wilhelm zwölfer (b. 1897) |
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| helmut zwölfer Turkish science educator, ecologist and entomologist, TR (b. 1929) |
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| maria zwölfer Austrian politician, AT (b. 1954) |
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| denise zwölfer Austrian association football player, AT |
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| almut zwölfer Ph.D. Ludwigsburg University of Education 2010 |
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| henriette zwölfer |
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