Origins
The Northern Wei compound surname 解枇氏
The Northern Wei had the compound surname 解枇氏, which was later changed to 解氏.
Reference: 解 jiě、jiè、xiè - 漢典
Documented Origin and Change
According to the page's quotation from the Xingyuan, 解枇氏 was recorded in the Northern Wei and was later changed to 解氏. This is a quotation of the Xingyuan made by the page, not independent verification of the original text.
Reference: 《解》的拼音,解字的意思、组词、部首、笔画、笔顺 - 汉语查
Research Notes
Evidence Limits
The supplied source provides no specific persons, commanderies, hall names, migration distribution, genealogy generation names, population data, or ethnic affiliation for 解枇氏, so these cannot be established from this source. It also only says that the surname was later changed to 解氏, without giving a date, place, or specific branch.
Reference: 《解》的拼音,解字的意思、组词、部首、笔画、笔顺 - 汉语查