Worldwide, Karlain (Karlain 
) is a rare principally masculine, but scarcely girly given name. The forename Karlain is characteristic of Sub-Saharan Africa, particularly the Democratic Republic of the Congo, where it is a rare male name. Much less frequently, Karlain is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Karlain | Democratic Republic of the Congo, Mexico, Philippines, India, United States |