When his genpuku (celebration of one's coming of age) took place on December 27, 1407 at Yoshimitsu ASHIKAGA's Kitayama-dai (Kitayama residence, a second home), Yoshimitsu personally granted Yoshisuke to use a portion of his name, "Yoshi," as an eboshioya (a person who puts an eboshi (cap) on the relevant person in a genpuku ceremony).
応永14年11月19日、足利義満の北山第において元服が行われ、義満自身が烏帽子親となって「義」の偏諱を授けた。