Meaning Derived from the Celtic rigantona meaning 'goddess'. Origin of Rhiannan Celtic , Irish Popular Middle Names Kathleen, May, Rae, Rose Pronunciation 🔊 Listen Rhiannan REE-an-an Similar Names Shayla Reanna Rianna Rihanna Meabh Rhiana Roisin Caitlyn Arlene Mariel Year by Year Popularity of Rhiannan