Origins
Origin as an Official Title Surname
According to the statement from the Surname Textual Research cited by the source, there was an official in charge of mounted troops in the Spring and Autumn period, and the official’s descendants adopted the title as their surname. The source classifies this as a surname derived from an official position.
Reference: 骑姓_骑姓的来源和历史_百家姓
Historical Records
Pronunciations and Textual Limits
The source also records “骑” with the departing-tone reading jì, says that it is included in the Zheng Tongzhi, Clan Records, and cites “Yan general Qi Jie” in the Records of the Grand Historian. It also notes that although chariots existed in the Spring and Autumn period, cavalry did not yet exist, so the claim about an official in charge of cavalry is untenable; the material is included only for reference.
Reference: 骑姓_骑姓的来源和历史_百家姓