Around the world, Decastillo (Decastillo 
) is an extremely rare unknown gender given name. Much more frequently, Decastillo is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Decastillo | Philippines, Australia, Canada, United States, Italy |
Amy, Fanny, Martha, Silvia, Carmen, Pamela, Raquel, Romulo, Richie, Delmar, Gloria, Lorena, Javier, Jomari, Teresa, Editha, Evelyn, Vienna, Isabel, Wilson, Welson, Melanie, Efren, Michael, Erika, Nikka, Jun, Sara, Alma, Amã, Adam, Aida, Rosa, Ruth, Lisa, Nilo, Eric, Maria, Sonia, Angel, Clara, Pablo, Roger, Rhoda, Denia, Josie, Jorge, Elena, and Antonio