Since he was born after childless Kaneie and his wife prayed to Bishamonten (Vaisravana) in Kurama region, Oguri was referred to as a Bishamonten's heaven-sent child.
子宝に恵まれない兼家夫妻が鞍馬の毘沙門天に祈願し生まれたことから、毘沙門天の申し子とされる。