Taira' maybe the same clan of TAIRA no Tsunezumi with the title of Kazusa no suke (Vice Minister of Kazusa Province), but 'Fujiwara' from the beginning, and 'Nakatomi' and 'Funya' that appeared in early Heian period were middle ranked aristocratic clans.
「平」は上総介平常澄の同族かもしれないが、「藤原」はもとより、「中臣」、「文屋」も、平安時代前期には中流貴族として出てくる氏（うじ）である。