Douay-Rheims 1899 American Edition (DRA)
42 And he brought him to Jesus. And Jesus looking upon him, said: Thou art Simon the son of Jona: thou shalt be called Cephas, which is interpreted Peter.
O...K...
Honestly, what is your point?
Jesus gave the name Kephas/Petros to Simon. The name means rock. Jesus called Simon, rock.
Simon was not known as Kephas/Petros until Jesus gave him that name and it is significant because until then, Rock was only attributed to God.
In Matthew 16, we learn WHY JESUS GAVE HIM THE NAME!