Surname Loonen (Loonen 
) , around the globe, is a rare cognomen. The cognomen Loonen is habitual in Netherlands, where it is quite a rare surname, Belgium, where it is a rare surname, and Greece, where it is a very rare surname. In absolute terms, it is commonest in Western Europe, particularly Netherlands, Belgium, and Germany. Very seldom, Loonen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Loonen | Germany, Netherlands, Belgium, Canada, United States |
| theodor van loonen Dutch painter, NL (b. 1610) |
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| charles loonen FR (b. 1850) |
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| kristijna loonen Dutch sportsperson and athletics competitor, NL (b. 1970) |
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| roel c g m loonen researcher |
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| t g j loonen researcher |
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| jeanine a c m loonen researcher |
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| anton jm loonen researcher (ORCID 0000-0003-4942-6195) |
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| maarten j j e loonen researcher (ORCID 0000-0002-3426-4595) |
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| nard loonen Ph.D. Universiteit Utrecht 2003 |
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| jacqueline loonen researcher, ORCID id # 0000-0002-9963-8367 |
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| linda m p loonen researcher |
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| iris loonen |
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| lobke loonen Dutch association football player, NL |
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