Family name Koolen (Koolen 
) , all over the world, is quite a rare last name. The cognomen Koolen is habitual in Netherlands, where it is quite a common surname, Belgium, where it is quite a rare surname, and Slovakia. In absolute terms, it most frequently occurs in Western Europe, particularly Netherlands, Belgium, and Germany. Very seldom, Koolen is the forename as well as the last name.
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| Koolen | Belgium, Romania, Germany, Canada, Netherlands |
| jacobus koolen painter from the Northern Netherlands, NL (b. 1639) |
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| peter koolen Dutch mayor, NL (b. 1776) |
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dionysius adrianus petrus norbertus koolen Dutch politician (1871-1945), NL (b. 1871) |
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| gerardus koolen Dutch politician, NL (b. 1823) |
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d.a.a. koolen Dutch engineer and professor (b. 1910) |
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| martinus koolen (b. 1874) |
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| harry koolen Dutch painter (1904-1985), NL (b. 1904) |
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| maria koolen Dutch Righteous Among the Nations, NL (b. 1905) |
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| antonius josephus maria koolen NL (b. 1897) |
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| harry koolen Dutch painter (1910-1990), NL (b. 1910) |
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| adrianus koolen NL (b. 1902) |
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kees koolen Dutch rally raid racer and businessman, NL (b. 1965) |
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janos koolen Dutch guitarist, NL (b. 1981) |
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| otto koolen (b. 1923) |
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| jurjaan koolen Dutch volleyball player (1938-2020), NL (b. 1938) |
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