However whether it is because it was thought that this surname would be disadvantageous in dealing with the issue of confirming official rank or, at some stage from Nobumitsu's time onwards he took this original family name, either way Ieyasu was known by the Fujiwara surname from a young age.
しかしこの姓では、官位受領などで不利に扱われると考えたのか、すでに信光のころから源姓を称しており、家康は若い頃はむしろ藤原姓を称している。