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The name Ríona is an Irish Gaelic feminine name derived from the Old Irish word rígan, meaning queen, itself rooted in the Proto-Celtic element rīganī. It functions as a shortened or simplified form of the older name Ríoghach and is closely related to the more elaborate compound name Ríoghnach, all sharing the same regal core meaning. The name connects to a long tradition of Irish female sovereignty figures and was borne by several early Irish saints. Variant forms include Riona, Reena, and the Latinized Regina, which carries the same underlying sense of queenship.