He doesn't have one. This is what I was able to find: The current structure (family name + given name) did not materialize until the 1870s when the government made the new family registration system. In feudal Japan, names reflected a person's social status. They also reflect a person's affiliation to Buddhist, Shintō, feudatory-military, Confucian-scholarly, mercantile, peasant, slave and imperial orders. In some cases, clan names were used with the particle "no" to show where they were from.