Roman Catechism 16.145

Chapter 16 — Part II: The Sacraments — Baptism

Section 145. The Name Given In Baptism — Finally, a name is given the person baptised. It should be taken from some person whose eminent sanctity has given him a place in the catalogue of the Saints. The similarity of name will stimulate each one to imitate the virtues and holiness of the Saint, and, moreover, to hope and pray that he who is the model for his imitation will also be his advocate and watch over the safety of his body and soul.