Do the regions of the creatures called ogres, oni, trolls, rakshasa overlap? Is it variation in a smooth process where the creatures are less likely to be vulnerable to the sun the farther you get from the Scandinavian equivalent? That would influence how they would be regarded.
And then there's the question of whether they would regard equivalents from foreign countries as foreigners or different species. Not that some of them would regard that as much of a difference.