Family name Geilen (Geilen 
) , around the world, is quite a rare last name. The cognomen Geilen is characteristic of Western Europe, particularly Netherlands, where it is quite a rare surname, Germany, where it is a rare surname, and Belgium. In absolute terms, it is commonest in Germany, Netherlands, and Ethiopia. Very seldom, Geilen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Geilen | Belgium, Netherlands, Germany, United States, Ethiopia |
| vitalis geilen (b. 1884) |
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| elisabeth geilen DE (b. 1898) |
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| gerd geilen German jurist, DE (b. 1931) |
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| heinz peter geilen DE (b. 1933) |
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| hannelore geilen German association football player, DE (b. 1950) |
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| irmgard geilen (born 1952) (b. 1952) |
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| jochen geilen (b. 1946) |
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| werner geilen (b. 1956) |
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| christoph geilen DE (b. 1960) |
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| stefan geilen DE (b. 1962) |
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| inge etm geilen researcher |
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| vitalis geilen Dr. phil. Georg-August-Universität Göttingen 1917 |
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| max benedikt geilen researcher (ORCID 0000-0002-3635-9715) |
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| sonja geilen (b. 1970) |
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| andreas geilen researcher (ORCID 0000-0001-8099-5607) |
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