Justin

wiktionary

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Name of early saints, Latin Iustīnus, from Iustus + -īnus, from iustus(“just”).

etymonline

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Justin

masc. proper name, from Latin Iustinus, literally "just," from iustus (see just (adj.)) + common name-forming element -inus (see -ine (1)). The Justinian Code was a compilation made by Justinian, emperor of the East, in 529.