Cognomen Loontjens (Loontjens 
) , globally, is a rare family name. The cognomen Loontjens is characteristic of Belgium, where it is quite a rare surname, Netherlands, and Sweden, where it is a rare surname. Measured by absolute frequency, the name is most common in Western Europe, particularly Belgium, Netherlands, and France. Very seldom, Loontjens is the forename as well as the last name.
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| Loontjens | Netherlands, Belgium, United States, Germany, France |
| petrus loontjens Belgian politician (1831-1901), BE (b. 1831) |
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| alfons loontjens BE (b. 1867) |
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| jacques loontjens Righteous Among the Nations, BE (b. 1903) |
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| marguerite loontjens Righteous Among the Nations, BE (b. 1904) |
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| petrus josephus loontjens BE (b. 1906) |
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| huub loontjens NL (b. 1906) |
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jannah loontjens Dutch writer and poet, NL (b. 1974) |
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| ton loontjens NL (b. 1922) |
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| ton j.a. loontjens researcher (b. 1945) |
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| robert loontjens association football player, NL (b. 1972) |
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| ton loontjens researcher (ORCID 0000-0002-6993-6515) |
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| arthur loontjens |
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| nora loontjens |
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