When he celebrated his coming of age, eboshioya (a person who put on an eboshi in the event of a genpuku ceremony) was Nagamori MASUDA, who was a key vassal of the Toyotomi clan and he was given the character '盛 (mori)' and used the name of Morichika.
元服のときは、豊臣氏の重臣・増田長盛を烏帽子親として「盛」の一字を授かって盛親と名乗った。