He is mentioned as 'Tsukushi no kuni no miyatsuko iwai' in "Nihonshoki," however, as described in the surviving fragment of "Chikugo no kuni fudoki" (the records of the culture and geography of Chikugo Province) and "Kojiki" (The Records of Ancient Matters), it is considered that he was actually called Tsukushinokimiiwai, which is a common view in the present day.
『日本書紀』には「筑紫国造磐井」（つくしのくにのみやつこいわい）として記されるが、実際は『筑後国風土記』逸文や『古事記』に見られるとおり、筑紫君磐井と称したと考えられており、この呼び名が通説となっている。