Meaning Riannon is a girls name of Celtic origin, it means a great skillful Queen. Origin of Riannon Celtic , Irish +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Riannon Riy-AEN-ahN Similar Names Rianne Rhienne Rianorix Rhianna Riana Tiona Anette Kinna Aife Bellicent Year by Year Popularity of Riannon