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