Cognomen Kupciunas (Kupciunas 
) , worldwide, is a rare surname. The surname Kupciunas is characteristic of Northern Europe, particularly Lithuania, where it is quite a rare surname, Norway, where it is a rare surname, and the United Kingdom, where it is an extremely rare surname. In absolute terms, it most frequently occurs in Lithuania, Norway, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Kupciunas | Canada, Norway, Lithuania, United States, United Kingdom |