Globally, Casteran (Casteran 
) is an extremely rare unknown gender forename. Predominantly, Casteran is the last name as well as the forename.
Mr, Juan, Neal, Elie, Elsa, Eric, Hugo, Ines, Iris, Ivan, Olga, Omar, Yves, Maria, Marie, Marta, Manon, Mirta, Sandy, Simon, Serge, Sonia, Jean, Sofia, Joel, Lola, Ms, Ana, Cã, Pio, Rã, Guy, Jan, Ugo, Marc, Mado, Sara, Samy, Alex, Anne, Arno, Paul, Rene, Remi, Dora, Lisa, Lori, Luis, and Alain