Family name Deelen (Deelen 
) , throughout the world, is quite a rare surname. The surname Deelen is characteristic of Western Europe, particularly Netherlands, where it is quite a common surname, Belgium, where it is a rare surname, and Switzerland. Not in comparison with a country's population, it most frequently occurs in Western Europe, particularly Netherlands, Germany, and Belgium. Very seldom, Deelen is the forename as well as the last name.
| adriaan jan deelen Dutch mayor, NL (b. 1782) |
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| adrianus andreas deelen Dutch politician, NL (b. 1827) |
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marjolijn van deelen EU Special Envoy for Non-proliferation and Disarmament, NL |
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| godofredo j. deelen (b. 1931) |
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| maurice deelen Dutch swimmer, NL (b. 1971) |
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| ineke deelen researcher |
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| timothy r van deelen researcher (ORCID 0000-0001-9471-6728) |
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| tom w van deelen researcher (ORCID 0000-0002-3666-4576) |
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| ron deelen military officer |
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| joris deelen researcher |
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| nikkie deelen high energy physicist at CERN |
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| dick van deelen Dutch radio dj, NL |
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| michel deelen Dutch diplomat |
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| noël deelen Dutch actor, NL (b. 1984) |
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| patrick deelen researcher, NL (b. 1986) |
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