I found this out recently from somewhere I don't remember
"The Yamato (大和民族, Yamato minzoku; lit. 'Yamato ethnicity') or Wajin (和人 / 倭人; lit. 'Wa people')[1] are an East Asian ethnic group that comprises over 98% of the population of Japan. Genetic and anthropometric studies have shown that the Yamato people predominantly descend from the Yayoi people, who migrated to Japan from the continent beginning during the 1st millennium BC, and to a lesser extent the indigenous Jōmon people who had inhabited the Japanese archipelago for millennia prior.[2]"
https://en.m.wikipedia.org/wiki/Yamato_people
"The Yamato (大和民族, Yamato minzoku; lit. 'Yamato ethnicity') or Wajin (和人 / 倭人; lit. 'Wa people')[1] are an East Asian ethnic group that comprises over 98% of the population of Japan. Genetic and anthropometric studies have shown that the Yamato people predominantly descend from the Yayoi people, who migrated to Japan from the continent beginning during the 1st millennium BC, and to a lesser extent the indigenous Jōmon people who had inhabited the Japanese archipelago for millennia prior.[2]"
https://en.m.wikipedia.org/wiki/Yamato_people