Yet, another theory (based on tracing lineage) suggests that the Soga clan descended from the migrant clans from Kudara (Baekje; one of three kingdoms on the Korean Peninsula) and settled there; however, these theories are yet to be verified.
または（系譜に現れる名前などから）その地に定住した百済系渡来人であった、などの説があるがいずれも定かではない。