[Elsie]

NIV Matthew 10:1-2
 1.  He called his twelve disciples to him and gave them authority to drive out evil  spirits and to heal every disease and sickness.
 2.  These are the names of the twelve apostles: first, Simon (who is called Peter) and his brother Andrew; James son of Zebedee, and his brother John;

 

 

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As you can see, Simon was already known as 'Peter' BEFORE the following verse came along.....

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NIV Matthew 16:18
    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.

 

 

In MY book at least, Matthew, chapter TEN comes before Matthew, Chapter SIXTEEN.

 

How do you get Jesus CHANGING his name????

[AlguyA]

"How do you get Jesus CHANGING his name????

From John Chapter1: 40 One of the two which heard John speak, and followed him, was Andrew, Simon Peter's brother. 41 He first findeth his own brother Simon, and saith unto him, We have found the Messias, which is, being interpreted, the Christ. F6 42 And he brought him to Jesus. And when Jesus beheld him, he said, Thou art Simon the son of Jona: thou shalt be called Cephas, which is by interpretation, A stone.

(Note the phrase is "shalt be called" indicating future tense. It doesn't say "is also known as." It doesn't say "has been called." It says, "shall be called.")

[polemikos]

Simon was already known as 'Peter' BEFORE the following verse came along

Sorry. As I mentioned in 781 above, I still don't get your point.
Jesus still names him "Rock".

"Simon whom he surnamed Peter" Mk 3:16 (KJV)
"Simon, whom he named Peter" Lk 6:14a (KJV)

Both the new name and the act of God changing the name are significant.