Around the world, Castelnau (Castelnau 
) is an extremely rare masculine given name. Much more prevalently, Castelnau is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Castelnau | France, Argentina, Poland, United States, Belgium |
| begon de castelnau catholic bishop |
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| guérin de castelnau Abt 1220 - 1299 |
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| barrave de castelnau |
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| hélie de castelnau |
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Mr, Yves, Maria, Marie, Marta, Maiko, Maddy, Sarah, Sonia, Alice, Aline, Alian, Alain, Andre, Aurã, Clara, Brice, Bruno, Karin, Pablo, Ruben, Denys, Frã, David, Hugo, Nico, Ms, Max, Cã, Guy, Lea, Lã, Jã, Hã, Yan, Marc, Spsy, Anne, Aude, Coco, Bill, Paul, Lili, Lise, Jose, Jean, Juan, Eric, and Laure