Last name Kleinjan (Kleinjan 
) , around the world, is quite a rare family name. The last name Kleinjan is characteristic of Western Europe, particularly Netherlands, where it is quite a rare surname, Austria, and Belgium, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Netherlands, the United States, and Austria. Much less frequently, Kleinjan is the forename as well as the last name.
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| Kleinjan | Belgium, Austria, Netherlands, South Africa, United States |
| gerhard kleinjan Dutch Righteous Among the Nations, NL (b. 1915) |
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| johanna kleinjan Dutch Righteous Among the Nations, NL (b. 1916) |
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| edward kleinjan activist from the Netherlands, NL (b. 1972) |
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| marloes kleinjan researcher ORCID ID = 0000-0002-4545-5549 |
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| kleinjan redelinghuys researcher |
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| arthur kleinjan NL (b. 1970) |
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| andy kleinjan college basketball player (2006–2007) South Dakota State |
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| gijs h kleinjan researcher |
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| johan kleinjan (b. 1974) |
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| anne kleinjan |
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| dirk a kleinjan |
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