According to "Hitachinokuni Fudoki," this land was once called Ki no kuni, but Tsukuba no mikoto who was kuninomiyatsuko during the reign of Emperor Sujin changed the name of Kuni to his name.
『常陸国風土記』によると、この地は昔は紀の国といっていたが、崇神天皇朝の国造の筑箪命が自分の名前の国名に改めたという。