Worldwide, Costan (Costan 
) is quite a rare largely masculine, but seldom female given name. The given name Costan is characteristic of Romania, where it is quite a rare epicene name, Indonesia, where it is a rare boy's name, and Philippines. More frequently, Costan is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Costan | Italy, Philippines, United States, Romania, Indonesia |