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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.
Justine /jus-tine/ [2 sylls.] as a girls' name is pronounced juss-TEEN. It is of Latin origin, and the meaning of Justine is fair, upright. Feminine of Justin. Justina was the original form. According to legend, Saint Justina (fourth century) was a Christian maiden who converted Cyprian, a powerful sorcerer.