Óengus is an Old Irish name, the original form of Aonghus, which is borne by a prominent god in Irish mythology. The name is believed to mean "one strength" or "true vigour," derived from Proto-Celtic elements *oino- ("one") and *guss- ("force, strength"). Medieval etymology connected it to "one desire," referencing a story where the goddess Boann named him after fulfilling her only wish. Mythological Significance In Irish mythology, Óengus (also known as Mac Óc or "young son") is a member of the Tuatha Dé Danann. He is the son of the Dagda and Boann, and is associated with youth, love, summer, and poetic inspiration. He plays a central role in several myths, such as the tale of how he acquired a wife through a trick involving swans. Óengus is often considered the Irish equivalent of the Welsh deity Mabon and the Gaulish god Maponos. Historical Bearers Beyond mythology, the name was borne by an 8th-century Pictish king and several Irish kings. A 9th-century bishop of Tallaght named Óengus is also recorded, known for his piety. The name survives in modern forms such as Angus (Scottish), Aonghus (Scottish Gaelic), Aonghas, and Aengus (Medieval Irish). The English diminutive Gus and Scottish Innes are also derived from it. Linguistic Development The spelling Óengus reflects the Old Irish pronunciation [ˈoːi̯ŋɡus]. In Middle Irish, it became Áengus, and in Modern Irish Aonghus [ˈeːnˠəsˠ]. The name is deeply rooted in Celtic onomastics and shares its etymology with the continuants in other Goidelic languages. Meaning: "one strength" or "true vigour" Origin: Old Irish, Proto-Celtic Type: Given name Usage Regions: Ireland (historical), Scotland (variant forms) Notable Associations: Irish god of love and youth; kings and saints