I'm probably missing something but... Could it be just one of the "tribe" of viera... I mean, we have Plainsflok and dunesfolk Lalafell... Maybe just maybe a Hrothgar is just the second tribe/type of viera... Cause you know, male viera are a thing in the lore and even in the artwork of viera, back in 2.0 they make clear that genderlock race aren't gonna be a thing and the second species of viera need a name anyway so...