Trịnh is a Vietnamese family name.
It exists in equivalent forms in other languages of the Sinosphere such as (鄭 ,Zheng, Cheng) in Chinese and Korean (Jeong, Chung).
[1] Families that bear the surname Trịnh are exclusively Vietnamese.
[citation needed] The surname further proliferated following the reign of the Trịnh lords in Tonkin.
[citation needed]