I just looked this up responding to another comment and noticed that Mt. Tateyama is actually the official name recognized by the Geospatial Information Authori

I just looked this up responding to another comment and noticed that Mt. Tateyama is actually the official name recognized by the Geospatial Information Authority of Japan. https://www.gsi.go.jp/common/000138865.pdf https://www.gsi.go.jp/common/000138865.pdf