From Welsh 'gwyn' meaning white, fair, or blessed.
Gwyn is one of the most elemental words in the Welsh language pressed directly into service as a name: it means "white," "fair," or "blessed," and in the mythological imagination of Wales those meanings were inseparable — whiteness was the color of the divine and the Otherworld. Gwyn ap Nudd, the spectral lord of Annwn (the Welsh Otherworld) and leader of the Wild Hunt, is one of the oldest figures in Celtic mythology, appearing in the Mabinogi and Arthurian legend alike. His name meant "white son of darkness," a paradox the Welsh poets found endlessly generative.
Historically, Gwyn functioned as a masculine name in Wales, though its cognate Gwyneth and related forms have long been used for women. The bardic tradition embraced Gwyn as both a name and a poetic descriptor — the great medieval Welsh poet Dafydd ap Gwilym used it in imagery of light, snow, and sanctity. In modern usage, the name has become genuinely gender-neutral, reflecting broader Welsh cultural practice of using the same root in both masculine (Gwyn) and feminine (Gwen, Gwyneth) forms.
Gwyn has experienced a quiet revival as part of the broader turn toward Celtic and Arthurian names. It appeals to parents who want something short, strong, and phonetically clean — single syllable, no ambiguous pronunciation — with deep mythological roots. Its association with light and blessing gives it a spiritual resonance that requires no religious specificity. In an era of longer, more elaborate names, Gwyn's spare elegance is increasingly its greatest asset.