Family name Kalfus (Kalfus 
) , all around the world, is a rare surname. The family name Kalfus is habitual in Czechia, where it is quite a rare surname, Israel, where it is a rare surname, and Switzerland. In absolute terms, this name is the most popular in the United States, Czechia, and Israel.
| VARIANT | COUNTRY |
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| Kalfus | Czechia, Switzerland, Israel, Australia, United States |
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josef kalfus Czechoslovak minister of finance and Czechoslovak politician, CZ (b. 1880) |
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radim kalfus Czechoslovak writer, CZ (b. 1920) |
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| oskar israel kalfus Holocaust victim, b. 1898-12-19, PL (b. 1898) |
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| jindřich kalfus holocaust victim, b. 1902-05-20, CZ (b. 1902) |
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ken kalfus American journalist, US (b. 1954) |
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| josef kalfus CZ (b. 1908) |
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| tomáš kalfus (b. 1921) |
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| maurycy kalfus PL (b. 1921) |
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| petr kalfus CZ (b. 1938) |
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| pavel kalfus CZ (b. 1942) |
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| jan kalfus Czech organist, CZ (b. 1956) |
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| renee ehrlich kalfus American costume designer, US |
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| radek kalfus (b. 1977) |
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| petr kalfus CZ (b. 1983) |
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