Cognomen Castricum (Castricum 
) , globally, is a rare last name. The surname Castricum is habitual in Netherlands, where it is quite a rare surname, Australia, where it is a rare surname, and New Zealand. In absolute terms, it is commonest in Netherlands, Australia, and Poland. Much less frequently, Castricum is the forename as well as the last name.
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| Castricum | Germany, Australia, United States, Poland, Netherlands |
| albertus johannes schuyt heer van castricum, bakkum, croonenburg en stabroek (1783-1855) (b. 1783) |
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frits castricum Dutch politician; Member of the House of Representatives of the Netherlands and European Parliament (1947-2011), NL (b. 1947) |
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| johan castricum (b. 1915) |
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simona castricum Australian architect, AU (b. 1975) |
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rutger castricum Dutch journalist, NL (b. 1979) |
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| cees castricum recipient of the Honorary Medal for Charitable Assistance |
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| adam castricum researcher |
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| vrs castricum researcher |
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| wed. w.h. castricum |
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| john castricum |
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| w.h. castricum |
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| c. castricum |
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| jan pietersz van castricum |
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