The "Jinja Yoroku" (Main Records of Shrines) refers to Ame no Mikumari no Okami as a god that controls the distribution of water such as water sources and river routes as well as rain, while in the "Jinmyocho Kosho" (Historical Back of Jinmyocho) and the "Yamatokoku Daisho Shojinja Shinmyoki narabini Engi" he is simply referred to as the god of water.
『神社要録』では「天水分神・国水分神」、『神名帳考証』『大和国大小諸神社神名記並縁起』では単に「水神」と記されている。