As for the Chinese character used to refer to Otani, "大谷," a different character "豅" was once used, and later Hongan-ji Temple used the Chinese character "豅山 (Otanizan) as "Sango."
大谷は「豅」の字が充てられたこともあったが、後に本願寺は「豅山」（おおたにざん）を山号とした。