Surname Karolein (Karolein 
) , worldwide, is an extremely rare cognomen. The surname Karolein is habitual in Latin America and the Caribbean, particularly Nicaragua, where it is a very rare surname, and Chile, where it is an extremely rare surname. More frequently, Karolein is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Karolein | Brazil, Nicaragua, Chile, United States, Peru |