Last name Gersain (Gersain 
) , worldwide, is a rare family name. The surname Gersain is characteristic of Latin America and the Caribbean, particularly Mexico, where it is a rare surname, Colombia, where it is a very rare surname, and Venezuela. Measured by absolute frequency, it is the most numerous in Mexico, Colombia, and Spain. Also, Gersain is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gersain | Mexico, Colombia, United States, Democratic Republic of the Congo, Angola |