"Kogo shui" (Gleanings of Old Words) mentions the name only in an oracle of tenson korin and note on norito, and among the extant fudoki (description of regional climate, culture, etc.), "Hitachi Fudoki" mentions the name only twice in the opening line.
また、『古語拾遺』本文では1箇所天孫降臨の神勅と、他に祝詞説明の注に、現存の風土記では『常陸風土記』冒頭2語あるのみである。