Cognomen Kupstys (Kupstys 
) , around the globe, is a rare family name. The cognomen Kupstys is habitual in Lithuania, where it is quite a rare surname, Spain, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. Not in comparison with a country's population, it most frequently occurs in Lithuania, Spain, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Kupstys | Canada, Spain, Lithuania, United Kingdom, United States |