Qu / Qu
The source lists 璩 as a currently uncommon surname, pronounced qú, and explicitly records it among Han and Mongolian groups. Thus, the page is discussing 璩 as a surname rather than an incidental character in a personal or place name.
Qu was the name of an ancient jade object, specifically an earring or jade ring; families that made or possessed such objects may have adopted it as their surname.
Reference: 最难读的十个姓氏，看一下你认识几个？_古代_封地_后代
璩 is connected with the surname 蘧, and both are pronounced qú; some people surnamed 璩 developed from the 蘧 surname.
The source says that 璩 is included in Zheng Tongzhi: Clan Records and relays the two origin explanations attributed to Xinshi Kaolüe; it also states that the associated commandery is Yuzhang. These are the webpage's reports of secondary material, not independent verification of the original texts.
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