The Sán Dìu (also known as San Deo, Trai, Trai Dat and Man Quan Coc; Chinese: 山由族; pinyin: Shān yóu zú; Jyutping: saan1 jau4 zuk6; Cantonese Yale: Sanyau Juk; Chữ nôm: 𠊛山由; Vietnamese alphabet: Người Sán Dìu) is a Yao ethnic group in northern Vietnam who speak Yue Chinese (Cantonese), a Chinese language. Although the Vietnamese government classifies San Diu as an independent group, San Diu people are originally a part of Chinese people in Vietnam. They are believed to have migrated from Guangdong, China around 1600.