Easton's Bible Dictionary (1897)
(abbreviation of Cleopatros), one of the two disciples with whom Jesus conversed on the way to Emmaus on the day of the resurrection (Luke 24:18). We know nothing definitely regarding him. It is not certain that he was the Clopas of John 19:25, or the Alphaeus of Matt. 10:3, although he may have been so.
Smith's Bible Dictionary (1863)
(of a renowned father), one of the two disciples who were going to Emmaus on the day of the resurrection. (Luke 24:18) Some think the same as Cleophas in (John 19:25) But they are probably two different persons. Cleopas is a Greek name, contracted from Cleopater, while Cleophas, or Clopas as in the Revised Version, is an Aramaic name, the same as Alphaeus.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
CLE'OPAS (very renowned), one of the two disciples who were met by Christ on the way to Emmaus. Luke 24:18. Some regard him as the same with Cleophas.