Family name Fensterseifer (Fensterseifer 
) , across the world, is a rare cognomen. The family name Fensterseifer is characteristic of Latin America and the Caribbean, particularly Cayman Islands, where it is quite a rare surname, Paraguay, and Brazil, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in Brazil, Paraguay, and Germany.
| VARIANT | COUNTRY |
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| Fensterseifer | Germany, Paraguay, Argentina, Brazil, United States |
| elton fensterseifer Brazilian association football player (1937-2010), BR (b. 1937) |
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| karina fensterseifer researcher |
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| isabel c m fensterseifer researcher |
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Mr, Kely, Raul, Rosa, Rosi, Roni, Rene, Liza, Lori, Luis, Luiz, Jose, Joao, Tais, Nara, Nair, Nico, Nilo, Elsa, Elma, Elmo, Eldo, Curt, Ceny, Asta, Adao, Ms, Sol, Ana, Ari, Rui, Leo, Liz, Lia, Ney, Ede, Elcy, Edy, Eva, Ivo, Udo, Marc, Mara, Sara, Alex, Alma, Anai, Arno, Ema, and Erna