Cognomen Sermuksnis (Sermuksnis 
) , across the world, is a rare family name. The family name Sermuksnis is characteristic of Lithuania, where it is quite a rare surname, Latvia, where it is a rare surname, and Brazil, where it is an extremely rare surname. Not in comparison with a country's population, this name is the most popular in Lithuania, Brazil, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Sermuksnis | Brazil, United States, Latvia, United Kingdom, Lithuania |