Last name อู (U 
, Oua 
, อู 
) , all over the world, is a widespread family name. The last name อู is habitual in Mongolia, where it is a common surname, Macao, and Liechtenstein, where it is quite a common surname (explore the name in all countries). In absolute terms, it is commonest in India, Indonesia, and China. More prevalently, อู is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| U | Myanmar, Taiwan, India, Indonesia, China |
| Oua | Myanmar, Morocco, Spain, Malaysia, Algeria |
| อู | Thailand |