Oíngus

Meaning: “one”

From oín (“one”), from Proto-Celtic *oinos, from Proto-Indo-European *óynos (“single, one”). The etymology of the second element is disputed; most likely it is gus (“strength, vigour”), from Proto-Celtic *gustus, or it may be from Proto-Celtic *gus- (“choose”), from Proto-Indo-European *ǵews-. The name also appears in early Welsh (as Old Welsh Ungust and Middle Welsh Unwst), allowing Proto-Celtic *Oinogustus to be reconstructed.