Cognomen Celkis (Celkis 
) , all over the world, is a rare surname. The surname Celkis is characteristic of Lithuania, where it is quite a rare surname, Poland, where it is a very rare surname, and Argentina, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Lithuania, the United States, and Poland.
| VARIANT | COUNTRY |
|---|---|
| Celkis | Poland, Argentina, Lithuania, United States |