In July 1438, a legitimate child of Mochiuji, Yoshihisa ASHIKAGA celebrated genpuku (one's coming of age); it was a common practice that a name would be given to the child taking one character given by the Shogun, but Mochiuji did not follow the tradition and named him Yoshihisa.
永享10年6月（1438年）、持氏の嫡子足利義久が元服を迎えて名を改める際、本来ならば将軍に一字を拝領する慣例であったが、それを行わず「義久」と名付けた。