Last name Constancy (Constancy 
) , in all the world, is a very rare family name. The surname Constancy is habitual in France, where it is a very rare surname, Israel, and Nigeria. More frequently, Constancy is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Constancy | Myanmar, France, Nigeria, Democratic Republic of the Congo, South Africa |