Family name William Barry (William Barry 
) , globally, is a very rare surname. The surname William Barry is habitual in Brunei, where it is quite a rare surname, Ireland, where it is a rare surname, and Chile, where it is an extremely rare surname. More frequently, William Barry is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| William Barry | Philippines, Spain, Reunion, Ireland, Brunei |