When the Mikasanomiya Imperial Household was established and took its name from the mountain in 1935, to humble it and show respect for the Mikasanomiya Imperial Household, it was renamed Mt. Wakakusa after mountain burning.
1935年、この山名に因んで三笠宮が創設される際に、同じ名前では恐れ多いとして山焼きに因んで若草山に改称した。