In all the world, Geert-Jan (Geert-Jan 
) is a rare male forename. The forename Geert-Jan is habitual in Western Europe, particularly Netherlands, where it is a rare male name, and Germany, where it is a very rare masculine name. Parts of the name also exists independently as a first name Geert, and a last name Jan.
| VARIANT | COUNTRY |
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| Geert-Jan | Belgium, Norway, Germany, Spain, Netherlands |
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geert-jan roebers Dutch writer, NL (b. 1961) |
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| geert-jan nillesen Dutch politician (1932-2014), NL (b. 1932) |
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| geert-jan van oostende (b. 1941) |
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| geert-jan buitenhuis (b. 1945) |
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| geert-jan koot Dutch art historian (1955-), NL (b. 1955) |
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| geert-jan hobijn Dutch sound artist, NL (b. 1959) |
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| geert-jan knoops Dutch lawyer and jurist, NL (b. 1960) |
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| geert-jan boons researcher (b. 1962) |
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| geert-jan derksen Dutch rower, NL (b. 1975) |
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| geert-jan van houtum Ph.D. Technische Universiteit Eindhoven 1995 |
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| geert-jan m de klerk researcher |
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| geert-jan witkamp researcher |
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| geert-jan houben researcher at Delft University of Technology |
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| geert-jan graulus researcher ORCID ID = 0000-0001-5445-3396 |
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| geert-jan van geffen researcher |
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Bos, Jansen, Hoving, Itjeshorst, Spapens, Bekkers, Boerhof, Bindels, Reukers, Derksen, Grinsven, Janssen, Nieveen, Engelen, Engbers, Huizing, Willems, Stravers, Bruinier, Kolsteren, Tuinstra, Hendriks, Linsen, Gooren, Ruiter, Peters, Kok, Van, Maas, Baan, Boer, Dijk, Jong, Haan, Vaes, Wolf, Nistelrooij, Smits, Braam, Poker, Geens, Groot, Nunen, Evers, Hento, Zomer, Meijer, Mulder, Bosch, and Timmermans