About the name "Peter" meaning "rock"

[Swing low, sweet chariot. Comin' for to carry me home.]

Please look in your Bible and reread Matthew 16:13-20.  You will notice that Jesus was speaking to his disciples (plural).  He asked them a question: "Who do people say that the Son of Man is?" 
Peter just happened to respond first (you can see his personality by looking at other verses involving Peter).
Peter (which when written in Greek is Petros or Petrus) and is masculine in gender.  Unlike the English language, some languages have feminine and masculine genders (ex. French, Spanish, Greek). 
When Peter responded, Jesus then said:  "Blessed are you, Simon Barjona...."  First of all, Jesus called Peter by his given name.  He did not call him "Petros" or Peter nor is Jesus implying that Peter is "the rock".  Rock is the Greek word "petra" and is feminine in gender.
Now please look at verse 18.  Jesus does use the words "this rock" which in Greek is again the feminine gender "petra".  "This rock" that Christ is speaking of does not refere to Peter, but rather to what Peter stated.  That being: "Thou art the Christ, the Son of the living God".  It is this confession before others of whom Christ is referring.  This is one of the steps towards salvation. 
Steps toward Salvation:
1) Hear the Word (Matt 7:26)
2) Believe (Rom 10:17)
3) Repent of your Sins (Acts 2:38)
4) Confess (Romans 10:9)
5) Be baptized (Mark 16:16)
6) Love God (Ecclesiastes 12:13)
6) Be faithful until death (Rev 2:10)
I hope this has been helpful 

My goodness.  Has jmfcst discovered cloning?

Must've been an odd DNA change that would change his font to blue.

dude, I don't even agree with what he is saying

[Swing low, sweet chariot. Comin' for to carry me home.]

What specifically do you not agree with??

First, you imply Jesus did not call Peter "Peter", but rather only referred to him by his birth name.  But the scripture says point blank that Jesus called him Peter:

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."

Second, it is clear Peter was the unquestioned leader of the early church, as Mat 16:18 implies. 

So, I don’t really agree with your position.

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But, I also don’t agree with the Catholic’s position, for it is clear when Paul was chosen, the scripture explicitly states that Peter was the lead Apostle to the Jews and Paul was the lead Apostle to the Gentiles (Gal 2:7-8).   Which is why the first half of Acts is centered on Peter’s ministry and the second half of Acts is centered on Paul’s ministry.  And when Paul was having to go before the Jerusalem Council (Acts 15, Gal 2:1-10), he said he didn’t care what position of authority Peter, John, and James held (Gal 2:6,9).  Paul was given the gospel through revelation and did NOT learn it from any man (Gal 1:11-12), Paul had direct authority from God that was NOT predicated upon the authority of Peter or anyone else. 

The whole purpose of the book of Galatians is to mow down the church leadership in order to show that leadership is fallible.  To do this, Paul starts with himself and tells about how he lived in Judaism as a enemy of Christ (Gal 1:13-14) and that it was God who chose Paul, not man (Gal 1:15-24).  Paul then, in chapter 2, mows down the supposed brothers who caused the need for the Jerusalem council.  Then Paul moves on to Peter, John, and James.  Then focuses on Peter's slide back into legalism.

Finally, in chapter 3, after mowing all the leadership down, including himself, Paul turns his guns on the Galatians and asks why they have allowed someone to distort the gospel that was given them.