蒙古的父系以Y-DNA haplogroup C為主,日本人不多。日本人最多的是O1b與韓國人一樣。日本與蒙古中間隔著韓半島,再如何蒙古血緣也不可能不經韓半島由韓半島人再轉傳日本。但韓半島的蒙古相關祖先並不多。日本人還有自認是以色列人後代的理論。日本人血統最接近韓國人,與漢人相近度遠大於與蒙古人的相近度,google關鍵字A population genomic PCA graph, showing the substructure of Eastern Asian populations,看圖片就了解。
It is said that japan king family originated from korea. Some japanese people said that japan population were coming from land from tiebet and indonesia from sea.