I just had a thought to myself about how the Dovahkiin is portrayed in the game. Sure it's set in Skyrim, the home of the Nords, and the return of the Dragonborn is a nordic legend. However weren't the previous dragonborn's mostly Imperial, like Tiber Septim? The dragonfires, Akatosh, etc.
I know any person of any race could potentially be Dragonborn. What i'm speaking of is more-so the origin.