From oín (“one”), from Proto-Celtic *oynos, 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-.
Oíngus m (genitive Oíngusa)
- (Irish mythology) The Gaelic god of love, youth, and poetic inspiration, son of the Dagdae and Boann of the Túatha Dé Danann.
- A male given name, corresponding to Angus.