Around the world, Costancio (Costancio 
) is a rare boy's first name. The forename Costancio is characteristic of Argentina, where it is a rare masculine name, Philippines, and Mexico, where it is a very rare masculine name. Measured by absolute frequency, the name is most common in India, Philippines, and Argentina. Also, Costancio is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Costancio | Philippines, Argentina, Chile, India, Mexico |