Throughout the world, Clase (Klase 
, Clase 
, Klaso 
) is a rare principally feminine, but very infrequently masculine forename. The first name Clase is habitual in Ethiopia, where it is a rare feminine name, India, where it is an extremely rare feminine name, and China, where it is an extremely rare boy's name. More prevalently, Clase is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Klase | Sweden, Ethiopia, South Africa, Algeria, United States |
| Clase | Sweden, South Africa, Algeria, Dominican Republic, United States |
| Klaso | Germany, India, Croatia, Philippines |