Cyclopedia of Biblical, Theological and Ecclesiastical Literature
is a name given to children at baptism to remind them of their solemn profession of that worthy name by which they are called. A similar custom prevailed at circumcision — the analogous Jewish rite. Clement I required candidates for baptism to go to their priest, give in their names, and then be taught the mysteries. Heathen names were prohibited, and those of apostles or saints usually adopted as memorials and examples of godly living. This spiritual name was entered in the baptismal register. In case of an immodest or uncomely name being given in baptism, the bishop at confirmation might alter it, by Peckham's Constitutions. In 1549 the bishop mentioned the Christian name of the candidate at confirmation. (See NAMES, CHRISTIAN).
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McClintock, John. Strong, James. Entry for 'Christian Name'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/encyclopedias/eng/tce/c/christian-name.html. Harper & Brothers. New York. 1870.