The "sango" (A name bestowed to each temple.) for Kanei-ji Temple was Toei-zan, which meant the Mt. Hiei of the east; and its "jigo" (temple name) was the era in which the temple was erected-- akin to Enryaku-ji Temple (in Mt. Hiei) which was built in the Enryaku era.
寛永寺の山号は東叡山、すなわち東の比叡山を意味しており、寺号は延暦寺と同じように建立時の年号から取られている。