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Origin of the name Justin: From the Latin JustÄ«nus, which is derived from justus (lawful, right, just). From A World of Baby Names by Teresa Norman.
Justinian was a Latin-speaking Illyrian and was born of peasant stock. Justinianus was a Roman name that he took from his uncle, the emperor Justin I, to whom he owed his advancement. While still a young man, he went to Constantinople, where his uncle held high military command.