Jiū / Chiu
The page explicitly lists “鸠” as a surname and separately presents claims involving descendants of the Zi surname, a surname of people from Tianzhu in the Western Regions, changes from compound surnames, and a Dai surname in Dehong, Yunnan. The source therefore covers more than one ethnic or naming tradition.
The source gives four origin claims: derivation from the Zi surname, with a 鸠 lineage after Song Weizi; a surname of people from Tianzhu in the Western Regions; a change to 鸠 from the compound surnames 鸠夷 and 鸠摩; and a Dai surname in Dehong, Yunnan. It lists these claims using formulations such as “derived from,” “after,” and “changed to,” without further establishing their relationship to one another.
For the claim that a 鸠 lineage existed after Song Weizi, the page says “see Lushi.” For the claim that the compound surnames 鸠夷 and 鸠摩 changed to 鸠, it says “also seen in Xingyuan.” These are citations relayed by the surname page; the supplied material does not contain the originals, so the primary texts cannot be treated as independently verified here.
The page gives no population count and provides neither a statistical year nor a definition of the statistic, so it cannot support a population estimate for the 鸠 surname. It also displays “rank: 9999th,” but gives no year, statistical basis, or methodology for that rank.
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