It is said that Itsuse no mikoto roared a virile cry, 'what a pity that I should die from a wound by the rebel,' and therefore, this site came to be called Onominato (literally floodgate of virility).
五瀬命は「賊に傷つけられて死ぬとは」と雄叫びしたので、その地を男之水門（雄水門）という。