Surnames Categorized "uncertain etymology"

This is a list of surnames in which the categories include uncertain etymology.
ARIAS Spanish
Possibly derived from a medieval given name, of Germanic origin.
MUÑOZ Spanish
Patronymic derived from the medieval Spanish given name Muño, from Latin Munnius, possibly of Germanic origin.
Meaning unknown.
WUOPIO Swedish
Meaning uncertain, possibly referred to a dweller in a narrow bay with steep shores.