The old Aramaic Peshitta of Matthew has Keepa/Keepa with no distinction like we find in Attic petros/petra, i.e. "You are Keepa, and upon this Keepa I will build my Church".
Here's a pdf of Matt 16 in Aramaic with the interlinear translation
It's all Greek to me :)
Anyway -- I wonder how many words there are for "rock" in the Aramaic, because in the Hebrew there are two main words for "rock" -- the Hebrew "tsur" and "cela" -- both massive rocks that can be used as foundations or strongholds.
But Jesus did not use those words for Peter's surname. Instead he called him "Cephas" -- "Keepa" in Aramaic from "keph" in Hebrew which means "a hollow rock".
A hollow rock is certainly not something that you would use as the foundation of your church [although many churches are built over grottos].
Please not the difference between the NASB and the Douay
It adds to the Holy Word of Elohim !In order to support man-made tradition !