Last name Kastelein (Kastelein 
, Castellain 
) , around the world, is a rare surname. The cognomen Kastelein is habitual in Netherlands, where it is quite a rare surname, Australia, where it is a rare surname, and Estonia. Not in comparison with a country's population, it is commonest in Netherlands, Brazil, and the United States. Much less frequently, Kastelein is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kastelein | Australia, Netherlands, France, Brazil, United States |
| Castellain | Australia, France, Brazil, United States, United Kingdom |
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dirk daniël willem johannes kastelein Dutch politician, NL (b. 1916) |
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| t.j. kastelein (b. 1928) |
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| j.j.p. kastelein physician from the Netherlands, NL (b. 1954) |
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| jaap kastelein musician (b. 1958) |
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| richard kastelein Canadian publisher, CA (b. 1967) |
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| arnoud w kastelein researcher |
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| ronald a kastelein researcher |
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| christopher kastelein researcher |
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| j.f. kastelein |
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| michael kastelein |
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