Analysis of information sources in references of the Wikipedia article "Yuzuki no Kimi" in English language version.
以上の来歴は、実際にはあまりあてにならず、近年では、秦氏は朝鮮半島の新羅地方出身であろうと考えられています。
The historical accounts are not very reliable, and in recent years it has been thought that the Hata clan came from the Silla region of the Korean Peninsula.— Fushimi Inari-taisha, https://inari.jp/about/history/num11/
古代に朝鮮半島から渡来した氏族。『日本書紀』応神天皇条に,秦始皇帝(しんのしこうてい)子孫という伝承をもつ弓月君(ゆづきのきみ)が多数の民を率いて渡来したのに始まるとしますが,「はた」は古代朝鮮語で海の意であり,実際は5世紀中頃に新羅から渡来した氏族集団と考えられます。
A clan that immigrated from the Korean Peninsula in ancient times. In the Emperor Ōjin section of Nihon Shoki, it is said that Yuzuki no Kimi, who is said to have been a descendant of the First Qin Emperor, led a large group of people to Japan. However, "Hata" means "sea" in ancient Korean, and it is thought that the tribe actually came from Silla in the mid-5th century.— Kyoto City, History of the City 01 [Hata clan], https://www2.city.kyoto.lg.jp/somu/rekishi/fm/nenpyou/htmlsheet/toshi01.html