Family name Castiau (Castiau 
) , globally, is a rare cognomen. The last name Castiau is characteristic of Cyprus, where it is quite a rare surname, Belgium, and France, where it is a very rare surname. Much less frequently, Castiau is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Castiau | Cyprus, United Kingdom, Belgium, South Africa, France |
| abel castiau French politician (1842-1918), FR (b. 1842) |
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| josiane castiau French swimmer, FR (b. 1954) |
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Mr, Yseult, Xavier, Mathieu, Melissa, Michael, Anthony, Pauline, Laurent, Lindsay, Thierry, Estelle, Vincent, Olivier, Caroline, Claudine, Clemence, Jonathan, Jean Luc, Jean-Luc, Thibault, Frederic, Thomas, Julien, Joelle, Pierre, Ms, Vã, Loã, Jain, Jean, Evan, Casti, Katty, Doran, Louis, Isabelle, Loïc, Naomy, Margot, Michel, Sophie, Anaïs, Aricia, Arthur, Amanda, Axelle, Pascal, Jessi, and Séverine