i highly doubt it's connected to a region, b/c regional vendors carry nothing when you don't own that region. but in general a vendor will sell less stuff when your city isn't in first.
Actually, this vendor may be like the Guild shop in that they only sell certain regional items based on whether windy owns the region that the item belongs to or not.
NPC name is 'Taajiji', and as the above poster points out, the correct coordinates at F-10, not F-7. I belive this is due to a change in map-layout. Wind. Waters now divided into North and South sections, so coordinates by the combined map are going to generally be wrong. Taajiji is in the Timbre Timbers Inn.