Family name Юкнис (Юкнис 
, Juknis 
, Yuknis 
) , worldwide, is a rare cognomen. The surname Юкнис is habitual in Lithuania, where it is a rare surname, Croatia, where it is a very rare surname, and the United States. In absolute terms, it is commonest in the United States, Russia, and Lithuania.
| VARIANT | COUNTRY |
|---|---|
| Юкнис | Kazakhstan, Russia |
| Juknis | United States, Lithuania |
| Yuknis | United States, Croatia |
| Yuknys | Argentina |