In all the world, Koosje (Koosje 
) is a very rare primarily female, but very infrequently masculine forename. The first name Koosje is habitual in Western Europe, particularly Netherlands, where it is a rare principally feminine, but very infrequently boy's name. Very seldom, Koosje is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Koosje | United Kingdom, Netherlands, Australia, Brazil, United States |
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koosje naret koning Dutch actress, NL (b. 1807) |
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koosje van voorn swimmer, NL (b. 1935) |
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| koosje lopes cardozo-fuente holocaust victim, b. 1920-01-05 (b. 1920) |
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| koosje wagenaar visual artist, NL (b. 1943) |
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| koosje van keulen NL (b. 1940) |
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| koosje sierman art historian (b. 1958) |
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| koosje p lamers researcher |
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Loo, Peters, Ridder, Ruijgrok, Rutten, Dedden, Docter, Doesen, Lamers, Jansen, Stabler, Klunder, Gerrits, Janssen, Jaspers, Vingerling, Zeeders, Schouten, Kuijpers, Lieshout, Jeanotte, Huisingh, Kievit, Kuperus, Koster, Kaijser, Van, Vos, Boer, Post, Dijk, Laan, Neal, Hurk, Wolf, Zoer, Vanbrenk, Koene, Leeuw, Logge, Lysen, Vokes, Vries, Zomer, Ansems, Aalzum, Bakker, Bolten, Damen, and Steenvoort