The page also states that cuo meant “lake” in the language of Tibetan ancestors and that using lake designations as surnames or personal names, represented by a phonetic Chinese character, produced the surname Cuo; it gives the pronunciation cù for this branch. This remains the source page's interpretation.
The page describes Cuo as a rare surname currently in use and as a Tibetan surname found in Tianjun, Qinghai, and included in the New Thousand Family Surnames. It also reports the surname in Beijing but says its origin is unknown.
According to the page, after the early Tang period, some ethnic minorities in areas influenced by Tibetan culture, including Yunnan, Guizhou, Sichuan, Qinghai, Gansu, and Shaanxi, adopted Cuo as a surname and transmitted it through generations. The page supplies no specific ethnic groups, migration routes, or genealogical evidence.
The source itself notes a possible misclassification: in a Tibetan name, “Cuo-X” may simply be a personal name meaning “born by a lake,” with Cuo treated as a surname only after the name is divided according to Han Chinese naming conventions. Thus, an initial Cuo in a personal name does not by itself prove surname status.
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