Last name Rönnbäck-Eck (Rönnbäck-Eck 
) , in all the world, is a very rare cognomen. The cognomen Rönnbäck-Eck is habitual in Northern Europe, particularly Sweden, where it is a rare surname. Parts of the name also exists independently as a last name Rönnbäck, and a last name Eck.
| VARIANT | COUNTRY |
|---|---|
| Rönnbäck-Eck | Sweden |
| wivi rönnbäck-eck Swedish artist, SE (b. 1944) |
|