What language are most spells, location names, and root towns in in "the World" of dot hack?

You know how "Mac Anu" means "Son of a Goddess", "Breg Epona" means "Exalted Mare", "Dol Dona" means, "Lia Fail" means "the Stone of Destiny", Fort Ouph means "Fort of Elves", and "Dun Loireag" from R:1 means "the Weaver Guardian" in BLANK language. And then you have spell words like "Ul Repth", "Ol Repth", "Vak Dom", etc. WHAT LANGUAGE IS THAT??!!