Family name วอย (Woi 
, Woy 
, วอย 
) , throughout the world, is quite a common last name. The cognomen วอย is habitual in Malaysia, where it is quite a rare surname, Bahamas, and Taiwan. In absolute terms, it is the most numerous in Malaysia, Indonesia, and Taiwan. Much less frequently, วอย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Woi | Indonesia, Taiwan, Ivory Coast, Malaysia, United States |
| Woy | Indonesia, Taiwan, Germany, Malaysia, United States |
| วอย | Thailand |
| Lvoy | Myanmar, Philippines |