Cognomen Grňa (Grňa 
) , all around the world, is a very rare family name. The family name Grňa is characteristic of Eastern Europe, particularly Czechia, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Grňa | Czechia |
|
josef grňa CZ (b. 1897) |
|
| josef grňa Czech Esperantist and teacher (1880-1919), CZ (b. 1880) |
|
|
| pavel grňa (b. 1937) |
|
|
| ján grňa Slovak soccer player (b. 1961) |
|