Rhiannon \rhi(an)-non\ as a girl's name is pronounced ree-ANN-on. It is of Welsh origin, and the meaning of Rhiannon is "great queen, or goddess". Mythology: the title Rigantona "great queen" is borne by a Celtic goddess of fertility. The Welsh horse goddess is described in legend as dressed in shining gold and riding a pale horse. The name was not used as a given name before the 20th century. In the 1970s: the Fleetwood Mac song "Rhiannon". See also Reanna and Riona.

Rhiannon has 14 variant forms: Rheanna, Rheanne, Rhiana, Rhiann, Rhianna, Rhiannan, Rhianon, Rhyan, Riana, Riane, Rianna, Rianne, Riannon and Rianon.

For more information, see also the related name Ryan.

A baby name that sounds like Rhiannon is Reannon.