Surname Keplin (Keplin 
, Кеплин 
) , worldwide, is a rare last name. The cognomen Keplin is habitual in Lithuania, where it is a rare surname, Poland, and Germany. Not in comparison with a country's population, it is commonest in Germany, the United States, and Poland. Much less frequently, Keplin is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Keplin | Germany, Brazil, Poland, United States, Malaysia |
| Кеплин | Kazakhstan, Russia, Ukraine |