Cognomen Uain (Wine 
, Wyn , Wain ) , worldwide, is a common surname. The cognomen Uain is habitual in Myanmar, where it is quite a common surname, the United Kingdom, where it is quite a rare surname, and Malta. Measured by absolute frequency, this name is the most popular in Myanmar, the United States, and the United Kingdom. Likewise, Uain is the forename as well as the last name.