*The bogus objection that "Petros" means "pebble" is a based on a confusion between Koine and classical Greek, and a lack of understanding of the rules of Greek grammar and word formation, which is why "informed" Protestant Biblical scholars (D.A. Carson, R.T. France, Oscar Cullmann, Herman Ridderbos, etc.) have discarded it.
Make up rules?
Not me; I just wanted to show that he was ALREADY known as 'ROCK'; before the verses that Catholicism uses to 'prove' that Peter was the ROCK; NOT the declaration of "And I tell you that you are Peter, and on this rock I will build my church, and the gates of Hades will not overcome it."
16. Simon Peter answered, "You are the Christ, the Son of the living God."
17. Jesus replied, "Blessed are you, Simon son of Jonah, for this was not revealed to you by man, but by my Father in heaven.