Chinese: Mandarin form of the surname 寇 meaning ‘invader’ in Chinese: (i) from the second element of the post name Si Kou (司寇) the title of an official in charge of penalties during the Western Zhou dynasty (1046–771 BC) and in the state of Wey during the Spring and Autumn period (770–476 BC). (iii) adopted as a surname by the Gu Kou Yin (古口引) family from the Xianbei ethnic group in northern China during the Northern Wei dynasty (386–534 AD). Chinese: alternative Mandarin form of the surnames 苟 勾 and 緱 see Gou 1- Chinese: variant Romanization of the surname 許 based on its Teochew or Hokkien pronunciations see Xu Cambodian: probably of Chinese origin (compare above).
Source: Dictionary of American Family Names 2nd edition, 2022