[verga]

Kephas is Aramaic for the word Rock and it only means rock., It has no other meanings. Neither the Greek equivalent Petros nor, with one isolated exception, Kephas is attested as a personal name before Christian times.

http://www.aboutcatholics.com/beliefs/the-origin-of-the-papacy/

Cephas meaning and name origin Cephas \ce-phas\ as a boy's name is of Hebrew origin, and the meaning of Cephas is "rock"., Biblical: what Jesus called his apostle Simon. Peter is the Latin translation by which he is more frequently known. Read more at http://www.thinkbabynames.com/meaning/1/Cephas#db7lKoj7sgcDzemP.99

[CynicalBear]

We can play dueling experts all day.

http://www.biblestudytools.com/lexicons/greek/kjv/kephas.html
The KJV New Testament Greek Lexicon
Strong's Number: 2786
Definition
Cephas = "stone"
another name for the apostle Peter

http://www.behindthename.com/name/kephas
USAGE: Biblical Greek
OTHER SCRIPTS: Κηφας (Ancient Greek)
Meaning & History
Greek form of CEPHAS

It really serves no purpose. Like I said, I understand the desperation of the Catholic believers to try to maintain some shred of evidence that Peter was somehow the person the church was built on. It simply isn’t true. The body of Christ, the church/assembly of believers, is built on the one true Rock which is not Peter.