Last name Michielsen (Michielsen 
) , in all the world, is quite a rare surname. The last name Michielsen is habitual in Belgium, where it is quite a common surname, Netherlands, where it is quite a rare surname, and Australia, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Belgium, Netherlands, and the United States. Very seldom, Michielsen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Michielsen | Netherlands, Canada, Belgium, United States, Australia |
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johan pieter michielsen Dutch military personnel, NL (b. 1862) |
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| matthijs willem gerardus michielsen NL (b. 1824) |
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anthonius benedictus michielsen (b. 1880) |
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| hendrik evert michielsen NL (b. 1852) |
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| adrianus joannes michielsen NL (b. 1862) |
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| leo michielsen NL (b. 1872) |
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| camille michielsen Belgian cyclist, BE (b. 1910) |
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| leo michielsen Belgian historian, BE (b. 1911) |
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| erik michielsen NL (b. 1917) |
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| ludo michielsen Belgian architect, BE (b. 1928) |
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harpert michielsen NL (b. 1970) |
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marion michielsen Dutch contract bridge player, NL (b. 1985) |
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| thérèse michielsen BE (b. 1926) |
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| jan michielsen Dutch painter (1939-2010), NL (b. 1939) |
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| aloïs michielsen businessman, BE (b. 1942) |
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