Family name Kozniyenko (Kozniyenko 
, Козниенко 
) , in the world, is a very rare cognomen. The cognomen Kozniyenko is characteristic of Russia, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kozniyenko | United States |
| Козниенко | Russia |