ok, first things first.
what is LIU?

as for the etymologies of xara:
when i was in highschool i played d&d with friends. when i needed a name for a new character i would simply roll dice and use what i got. (if it was pronouncable.) doing that i got xar. to make it feminine, i added the 'a' to the end. later i found out from a greek friend that it meant happiness in greek, which i've never verified myself, so i only assume this is correct. hence xara