Chui

Chui or Tsui is an ancient Chinese family name and surname of a clan in ancient China. The Chinese character is 徐 in both cases, as is used interchangeably in Hong Kong, Cantonese, and Taiwanese using Yum biu -音標; This is as distinct from Xu in the second/ out of five Pin Yin intonation; with the same (unique) Chinese character 徐 as in mainland China standard Mandarin Pin Yin 拼音. The Chinese character literally means slow.