However, Hikoyai no mikoto is not described in the "Nihon Shoki" (Chronicles of Japan); and according to the "Shinsen Shojiroku" (Newly Compiled Register of Clan Names and Titles of Nobility) and the "Aso-shi Keizu" (The Family Tree of Aso clan), Hikoyai no mikoto is referred to as a son of Kamuyaimimi no mikoto.
しかし、『日本書紀』には日子八井命の名は無く、『新撰姓氏録』・『阿蘇氏系図』では神八井耳命の子となっている。