Family name Loosen (Loosen 
, คลายนา 
) , throughout the world, is quite a rare last name. The last name Loosen is characteristic of Western Europe, particularly Belgium, where it is quite a rare surname, Germany, and Netherlands, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Germany, Thailand, and Belgium.
| VARIANT | COUNTRY |
|---|---|
| Loosen | Belgium, Netherlands, France, Germany, United States |
| คลายนา | Thailand |
| samuël snouck van loosen politician (1766-1839) (b. 1766) |
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| margaretha maria snouck van loosen NL (b. 1807) |
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| johann georg loosen DE (b. 1846) |
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| philipp loosen Civil servant and mayor of Trier, DE (b. 1880) |
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| friedrich wilhelm loosen (1885-1964) (b. 1885) |
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| franz loosen (b. 1900) |
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| josef loosen DE (b. 1904) |
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| johann van loosen German Nazi concentration camp inmate, capo and camp elder at Gusen II concentration camp, DE (b. 1914) |
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wiebke loosen German university teacher, DE (b. 1966) |
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| paul loosen German politician (1924-2001), DE (b. 1924) |
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| bruno loosen DE (b. 1922) |
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| sven h loosen researcher |
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| alisa loosen researcher |
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| ernst loosen German winemaker |
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| anne e loosen researcher (ORCID 0000-0002-6145-4044) |
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