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The name Úan (sometimes rendered Uan) is of Old Irish origin, derived from a diminutive form meaning little lamb, from the Old Irish word uan, cognate with Latin agnus and Greek amnos, all rooted in the Proto-Indo-European concept of a young sheep. It was used in early medieval Ireland as a personal name, appearing in hagiographic and genealogical records associated with minor saints and ecclesiastical figures. The name is closely related to the broader family of Irish lamb-derived names and shares conceptual kinship with the Latin Agnus as a given name tradition.