Names given to individuals at their Baptism.
One of the duties of pastors in regard to Baptism is the exercise of care, in order that a Christian name be given to the one baptized.
This accords with a venerable Catholic custom always insisted upon by the Church, and now reaffirmed as a law in the new Code of Canon Law.
The and warn against the choice of "obscene, fabulous or ridiculous names" and "names of vain deities or of impious pagans."
The names of the saints are to be to the baptized who bear them, sources of imitation, protection, and intercession.
New Catholic Dictionary