[@Gendarme]
Vohemians I'd imagine would looked upon as barbarians domesticated by the church. Serfs are generally considered to be dirty and simple minded and their nobility is stuck up. Border barons are seen as exploitive, only lauding their loyalty to Vohemia when it suits them and being nothing more than jumped up raiders.
King Zikmund 3rd is a sado-masochist. He's also very cruel to prisoners and is a proponent of torture in times of "national concern". Anything around that really is ample fodder for all sorts of talk and names.

[@Hygswitch]
If you want the city to have a southern half on the south bank of the river, then sure. I'd say though that we should make the city wall the actual border itself. I think it'd just be easier if we had a clear definition between our states, either natural or man-made, rather than a nebulous stretch of land.
I'm sure the city could provide itself with enough food on the northern bank of the river without having any farmland on the southern side.