Easton's Bible Dictionary (1897)
A Syriac surname given by Christ to Simon (John 1:42), meaning “rock.” The Greeks translated it by Petros, and the Latins by Petrus.
Smith's Bible Dictionary (1863)
[Peter]
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
CE'PHAS (rock), a Syriac surname given to Simon, which in the Greek is rendered Petros, and in the Latin Petrus, both signifying "a rock." John 1:42. See Peter.
Hitchcock's Bible Names (1869)
a rock or stone