Last name อุ่ย (Ui 
, อุ่ย) , all over the world, is quite a common family name. The cognomen อุ่ย is habitual in Macao, where it is quite a rare surname, Malaysia, and Oman, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Indonesia, Malaysia, and China. Also, อุ่ย is the forename as well as the last name.