Cognomen Úna (Una 
, Oona 
, Úna 
) , globally, is a common family name. The surname Úna is characteristic of Paraguay, where it is quite a rare surname, Iceland, and Serbia. Measured by absolute frequency, it is commonest in India, Indonesia, and Nigeria. More frequently, Úna is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Una | United Kingdom, Indonesia, Serbia, United States, India |
| Oona | United Kingdom, South Africa, United States, Ireland, India |
| Úna | United Kingdom, Netherlands, United States, Ireland, France |
| ウナ | Japan |
Rea, Taaffe, O'Shea, Whelan, Mc Cabe, Mcbreen, Carroll, Barrett, Brosnan, Lucey-Lee, Fleming, O'Brien, Connolly, Kavanagh, Dirisamer, Donnelly, Hartnett, Flanagan, O'Connor, O'Mahony, Mclaughlin, Rutherford, Grogan, Rourke, Patton, Curran, Bray, King, Race, Rice, Ryan, Daly, Artus, Byrne, Kelly, Keane, Fitzgerald, Roddy, Nolan, Harty, Hogan, Flynn, Walsh, Quinn, Murphy, Sheedy, Cahill, Clarke, Grant, and O'Sullivan