Surname Fierens (Fierens 
) , throughout the world, is quite a rare last name. The cognomen Fierens is characteristic of Belgium, where it is quite a common surname, Netherlands, where it is a rare surname, and Ireland. Measured by absolute frequency, this name is the most popular in Western Europe, particularly Belgium, France, and Netherlands. Very seldom, Fierens is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Fierens | Netherlands, Argentina, Belgium, United States, France |
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hippolyte fierens gevaert Belgian art historian, BE (b. 1870) |
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auguste fierens Belgian association football player, BE (b. 1892) |
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| laurent fierens Belgian lawyer, BE (b. 1850) |
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| ernest fierens BE (b. 1841) |
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| louis fierens Belgian archer (1877-1967), BE (b. 1877) |
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| alfons fierens Geboren op 21/11/1880, gestorven op 18/10/1921 (b. 1880) |
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| gustave fierens (b. 1881) |
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| andré fierens Belgian footballer (1898-1971), BE (b. 1898) |
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| paul fierens BE (b. 1895) |
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marc fierens BE (b. 1956) |
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| theo fierens cyclist, BE (b. 1949) |
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| thea fierens Dutch politician, NL (b. 1950) |
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| kris fierens Belgian painter, BE (b. 1957) |
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| luc fierens Belgian artist, BE (b. 1961) |
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| pablo i fierens researcher (ORCID 0000-0001-5725-0017) |
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