All over the world, Rhiain (Rhiannon 
, Rhianwen 
, Rhiain ) is a common female first name. The given name Rhiain is characteristic of Guernsey, where it is quite a common female name, Reunion, and Australia. In absolute terms, this name is the most popular in the United States, the United Kingdom, and Australia.
| VARIANT | COUNTRY |
|---|---|
| Rhiannon | United Kingdom, Australia, United States, Canada, New Zealand |
| Rhianwen | United Kingdom, South Africa, Australia, United States, New Zealand |
| Rhiain | United Kingdom, United States, Australia |
Mort, Morris, Morgan, Murphy, Musser, Sovine, Clarke, Cliffe, Craven, Davies, Hudson, Foster, Mumford, Arundel, Bonnici, Dowding, Johnson, Elliott, Edwards, Hackles, Sullivan, Casseldine, Mackie, Martin, Umney, Yeark, Bebb, King, Knox, Paul, Rice, Love, John, Hull, Fahy, Moses, Alexander, Selby, Boyes, Bower, Burns, Pewtner, Lewis, Lloyd, James, Jones, Julio, Yates, Bevan, and Finlayson