they are different volcanoes i unfortunately haven't got a photo of hl ufell to upload but here's a link to one i can't seem to find a decent map of iceland online but hl ufell is southwest of langj kull and her ubrei is north of vatnaj kull just northeast of askja i would think that her ubrei is considered iceland's most famous tuya and i haven't heard any such sentiment about hl ufell neither of the names mean tuya but i think the best translation of tuya might be b rfell which name many icelandic mountains possess best regards