From ùja + ìmẹ̀ṣẹ̀, ultimately from ùja (“chanting, chant”) + àri (“without”) + mọ̀ (“to know”) + ìṣẹ̀ (“origin, source”), literally “The chants that we do not know the origin of”.
ùjaamẹ̀ṣẹ̀