Across the world, Costacio (Costacio 
) is a very rare masculine first name. The given name Costacio is habitual in Southern Asia, particularly India, where it is an extremely rare masculine name. More prevalently, Costacio is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Costacio | India, Philippines |
May, Pauline, Paulito, Rosalie, Rondhel, Regimar, Lorenza, Luisito, Julieta, Eugenia, Shalini, Yolanda, Mikaella, Benjamin, Leonardo, Jennifer, Edelbeto, Edelwina, Eufrecina, Ivan John, Kim Carloniel, Mercedes, Evangeline, Mercita, Ofdelia, Kyla, Ruby, Ruel, Leon, Lean, Joel, Jojo, June, Elsa, Maribel, Maria, Pedro, Ruben, Loida, Joven, Julie, Ester, Marcos, Jayson, Norwin, Sofia, and Christopher