Surname Theelen (Theelen 
) , in the world, is a rare family name. The family name Theelen is characteristic of Western Europe, particularly Netherlands, where it is quite a rare surname, Belgium, where it is a rare surname, and Germany. Very seldom, Theelen is the forename as well as the last name.
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| Theelen | Australia, Netherlands, Belgium, Germany, Canada |
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frans theelen Belgian politician and editor, BE (b. 1885) |
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damian johannes theelen NL (b. 1877) |
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| nicolaas theelen Bilzen , 25 juni 1848 - Tongeren , 2 juli 1918 (man) (b. 1848) |
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| gerard theelen Dutch sculptor, NL (b. 1880) |
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| petrus theelen Dutch Righteous Among the Nations, NL (b. 1903) |
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| bernardina theelen Dutch Righteous Among the Nations, NL (b. 1910) |
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| heinrich theelen association football player (1917-1973) (b. 1917) |
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| jan theelen Dutch record producer, NL (b. 1939) |
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| ulrich theelen (b. 1962) |
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| maik m p theelen researcher |
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| bart theelen mycologist |
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| bart theelen botanist |
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| mirjam theelen researcher ORCID ID = 0000-0002-3864-1933 |
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| mathijs theelen researcher (ORCID 0000-0003-1865-5497) |
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| willemijn theelen researcher |
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