Surname Castelyn (Castelyn 
) , in all the world, is a rare cognomen. The family name Castelyn is characteristic of South Africa, where it is a rare surname, United Arab Emirates, and Belgium. Not in comparison with a country's population, it most frequently occurs in South Africa, Belgium, and France.
| VARIANT | COUNTRY |
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| Castelyn | Belgium, United Kingdom, South Africa, United Arab Emirates, France |
| f. castelyn cyclist (1922-2007), BE (b. 1922) |
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| eveleen castelyn South African poet, ZA (b. 1928) |
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| casper castelyn Dutch artist (active 1653) |
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| elizabeth castelyn |
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| william castelyn, of london |
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| john castelyn, of lymesworth, derbs |
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Mr, Ilze, Maria, Marna, Morne, Susan, Aline, Alida, Alwyn, Andre, Anton, Amore, Adrie, Charl, Keith, Petro, Peter, Ronel, Danny, David, Diane, Gavin, Ilsa, Geert, Irma, Eric, Ms, Sue, Jan, Ian, Mike, Sean, Sven, Anna, Kyle, Rudi, Ryno, Dirk, Leon, Louw, John, Joye, Jess, Jean, Theo, Nico, Elme, Vera, and Grant