Cognomen Castelnau (Castelnau 
) , around the world, is quite a rare last name. The last name Castelnau is characteristic of France, where it is quite a rare surname, Belgium, where it is a rare surname, and Argentina, where it is a very rare surname. In absolute terms, it is commonest in France, Argentina, and Poland. Much less frequently, Castelnau is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Castelnau | Belgium, United States, Poland, Argentina, France |
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jacques de castelnau French soldier, FR (b. 1620) |
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| jean-baptiste géréon de curières castelnau (b. 1734) |
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| gabriel de castelnau French historian, FR (b. 1757) |
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henri-pierre castelnau French soldier and officer (1814-1890), FR (b. 1814) |
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amélie-julie charlotte castelnau British art collector and philanthropist, FR (b. 1819) |
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| louis boileau de castelnau French military officer and politician (b. 1770) |
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| louis-michel castelnau French politician, FR (b. 1771) |
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| henriette de montault de castelnau (b. 1763) |
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| junius castelnau French lawyer, magistrate and historian, FR (b. 1795) |
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léonce de castelnau French politician and lawyer (1845-1909), FR (b. 1845) |
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| philippe boileau de castelnau French physician, FR (b. 1798) |
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emmanuel boileau de castelnau French alpinist, FR (b. 1857) |
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| jules castelnau (b. 1804) |
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| michel de castelnau French lawyer and politician (b. 1818) |
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| albert castelnau French politician (1823-1877), FR (b. 1823) |
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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