After celebrating his coming of age, he called himself Tsunemochi ICHIJO, started to call himself Harumochi OUCHI, after being granted and using one of the Chinese characters used in the name of Yoshiharu ASHIKAGA, when he was adopted by the Ouchi family.
元服して一条恒持と称し、大内家の養子となると同時に足利義晴から一字を賜って大内晴持を名乗った。