the RCC teaches something different than the Bible on this:
2156 The sacrament of Baptism is conferred “in the name of the Father and of the Son and of the Holy Spirit.”85 In Baptism, the Lord’s name sanctifies man, and the Christian receives his name in the Church. This can be the name of a saint, that is, of a disciple who has lived a life of exemplary fidelity to the Lord. The patron saint provides a model of charity; we are assured of his intercession. The “baptismal name” can also express a Christian mystery or Christian virtue. “Parents, sponsors, and the pastor are to see that a name is not given which is foreign to Christian sentiment.”86 (232, 1267)
Men are not sanctified by reciting Jesus name over them, especially infants who have no idea what is being done nor any meaning of it
Saints are NOT people who live meaningful lives, either, a person can be a wicked sinner such as the man in first Corinthians who had sex with his own mother yet Paul never once said his salvation was not real. A person becomes a saint at Salvation, not baptism or through faithful living.
As for the assurance of a ‘patron saint’ intercession, there is zero mention in the Bible of anyone’s promised prayers and intercession except Jesus Christ and the work of the Holy Spirit. We are called to pray for others, but there is zero guarantee of it.
When you read Acts 16:33... is there something in your version of the Bible that specifically omits children below a specific age?