According to a theory which identifies 'Bu' as Emperor Yuryaku, the Chinese character '武' can be read 'Bu' as well as 'Takeru' which corresponds to a part of the king's name inscribed on iron swords (Wakatakeru no Okimi [the Great King Wakatakeru] in Inariyama-kofun Tumulus, and the Wa□□□ru no Okimi in Eta Funayama Tumulus) and this king has been identified as Emperor Yuryaku, whose real name and his Japanese-style posthumous name (Ohatsuse no Wakatakeru no Mikoto in "Nihonshoki" and Ohatsusewakatakeru no mikoto/Ohatsuse no miko in "Kojiki") commonly include 'Takeru'.
「武」は、鉄剣・鉄刀銘文（稲荷山古墳鉄剣銘文獲加多支鹵大王と江田船山古墳の鉄剣の銘文獲□□□鹵大王）の王名が雄略天王に比定され、和風諡号（『日本書紀』大泊瀬幼武命、『古事記』大長谷若建命・大長谷王）とも共通する実名の一部「タケル」に当てた漢字であることが明らかであるとする説がある。