Currently Display Name is set as "Erik VII, "Segersäll" Björnsson, King of the Svear".
I checked the English, Swedish, Norwegian, Danish, German and Spanish wikipedias and scanned the profile About section to see where the VII comes from.
English wiki makes this statement "Sometimes, Eric the Victorious is referred to as either King Eric V or VI, modern inventions based on counting backwards from Eric XIV ".
The other 5 versions of wiki that i checked are silent on the matter.