The concept of orcs was ultimately derived from Persian mythology though, and long before the earliest known ogre ("oni" in Japanese) tales, so the Japanese must have been influenced by merchants from the Middle East. The reason orcs entered modern fantasy tropes is because of Tolkien influence, but orcs ("div" in Farsi, something like "daewa" in Avestan) did not originate there. Tolkien was evidently influenced by the Shahnameh, a Medieval Persian retelling of Zoroastrian myths, and even the term "Asmodeus" originally derived from a Greek mangling of the Avestan term for "white orc".