Enjaku' is originated from the Haimyo (also known as Haimei; the term originally refers to a pen name as a haiku poet, but it also refers to a kabuki actor's offstage name which can be used officially and privately) of the former master Gakujuro JITSUKAWA.
「延若」は師匠だった實川額十郎の俳名に由来する。