Throughout the world, Willem-Jan (Willem-Jan 
) is a rare boy's first name. The given name Willem-Jan is characteristic of Western Europe, particularly Netherlands, where it is a rare boy's name, Belgium, and Germany, where it is a very rare masculine name. Very seldom, Willem-Jan is the last name as well as the forename. Parts of the name also exists independently as a first name Willem, and a last name Jan.
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| Willem-Jan | Germany, France, United States, Netherlands, Belgium |
| willem-jan van loenhout Dutch bicycle racer, NL (b. 1965) |
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| willem-jan wollants researcher |
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| willem-jan flu researcher |
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| willem-jan emsens researcher ORCID ID = 0000-0002-2667-237X |
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| willem-jan de leeuw researcher |
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| willem-jan marijnissen researcher (ORCID 0000-0003-3188-5844) |
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| willem-jan van zeist researcher (ORCID 0000-0002-6371-8509) |
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| willem-jan keune researcher, ORCID id # 0000-0001-6607-5898 |
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| willem-jan metsemakers researcher ORCID ID = 0000-0002-4114-9093 |
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| willem-jan m schellekens researcher |
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| willem-jan van hoeve Ph.D. Universiteit van Amsterdam 2005 |
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| willem-jan welboren researcher |
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| willem-jan van der ven |
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| willem-jan stouthart |
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De, Kramer, Kleijn, Dekker, Jansen, Jacobs, Visser, Coppens, Brouwer, Korsten, Dekkers, Lauwers, Hermans, Schipper, Scholten, Bichelaer, Persoons, Westland, Mandersloot, Vermeulen, Langevelde, Wijnbergen, Kuiper, Bomhof, Altena, Stoker, Pot, Hak, Wit, Meer, Smit, Blok, Kaak, Dijk, Laan, Lems, Van Der Velden, Lock, Hahn, Hens, Veen, Storm, Brink, Broek, Derks, Vries, Vliet, Meijer, Jong, and Van Der Heijden