Family name Ní Riain (Ní Riain 
) , around the globe, is a very rare surname. The surname Ní Riain is characteristic of Northern Europe, particularly Ireland, where it is quite a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ní Riain | Ireland |
|
nóirín ní riain Irish singer and theologian, IE (b. 1951) |
|
| róisín ní riain |
|