Around the world, Castillio (Castillio 
) is an extremely rare masculine first name. Much more frequently, Castillio is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Castillio | Brazil, Saudi Arabia, United States, Philippines, Colombia |
Ms, Steve, Allan, Carla, Carol, Karen, Kelly, Kevin, Pilas, Rocio, Reven, Diana, Diego, Donna, Glain, Larry, Lilia, Lorna, Lucia, Jacob, Jayar, Jorge, Mabel, Jesse, Marco, Maria, Leo, Mary, Mark, Mike, Anna, Ania, Asia, Ruth, Rudy, Gary, Luis, Lupe, Jane, Jose, John, Joel, Juan, June, Tony, Ella, Eric, Mario, and Jesus