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Last name 昌由 (昌由 ) , around the globe, is an extremely rare family name. Much more prevalently, 昌由 is the forename as well as the last name.
Masayuki, Масаюки, まさゆき, 将之, 征之, 政之, 政行, 昌之, 昌幸, 昌行, 正之, 正幸, 正行, 真幸, 雅之, and 雅行