In the family tree of the Yoshida clan (submitted by a direct retainer of the shogun Insai school soke - head of the Insai school) of Kansei-Choshu-Shokafu (genealogies of vassals in the Edo Bakufu) edited during late Edo period, concerning the origin, it was written, 'Uda-Genji (Minamoto clan), an illegitimate family lineage of the Sasaki family. According to present's accepted genealogy, it is said to be from Genshu YOSHIDA.'
江戸時代後期に編纂された寛政重修諸家譜の吉田氏系図（印西派宗家の旗本吉田氏が提出したもの）には、出自について「宇多源氏　佐々木庶流　今の呈譜に吉田厳秀より出るといふ。」とある。