Origins
Sinicization from the Qibiao Clan
The Qibiao clan, one of the twelve Gaoche groups, later adopted the phonetically similar single-character surname Biao.
Reference: 表姓_表姓的来源_表姓族谱_姓氏表姓的名人_表氏家谱_百家姓
Biaoshi County of Jiuquan
One branch originated from Biaoshi County in Jiuquan Commandery during the Western Han. Some residents adopted Biaoshi as a surname, which later became the compound surname Biaoshi and was then shortened to Biao.
Reference: 表姓_表姓的来源_表姓族谱_姓氏表姓的名人_表氏家谱_百家姓
Baekje Xinchang Lineage
One Biao lineage among the Korean ethnic group originated from the ancient Baekje Xinchang community and took its surname from the name of a settlement in Xinchang.
Reference: 表姓_表姓的来源_表姓族谱_姓氏表姓的名人_表氏家谱_百家姓
Mongol Biaote Lineage
The Mongol Biaote clan, also called Biaote with the characters 标特 or 彪特, lived in Harqin. From the mid-Qing period onward, some members adopted Biao as a Han Chinese surname.
