Pay attention:
Matthew 8:14 And when Jesus entered Peter's house, he saw his mother-in-law lying sick with a fever;
Matthew 10:2 The names of the twelve apostles are these: first, Simon, who is called Peter, and Andrew his brother; James the son of Zeb'edee, and John his brother;
Matthew 14:
28 And Peter answered him, "Lord, if it is you, bid me come to you on the water."
29 He said, "Come." So Peter got out of the boat and walked on the water and came to Jesus;
Matthew 15:15 But Peter said to him, "Explain the parable to us."
Tell what to Mr. Reggie? Was he or was he not called "Peter" before your magic ROCK event?
From these examples we only see that St. Peter was called Peter by Evangelist Matthew who wrote after the events in Matthew 16.