Easton's Bible Dictionary (1897)
Mercury, a Roman Christian to whom Paul sends greetings (Rom. 16: 14). Some suppose him to have been the author of the celebrated religious romance called The Shepherd, but it is very probable that that work is the production of a later generation.
Smith's Bible Dictionary (1863)
(Mercury), the name of a Christian resident at Rome to whom St. Paul sends greetings in his Epistle to the Romans. (Romans 16:14) (A.D. 55.) Irenaeus, Tertullian and Origen agree in attributing to him the work called The shepherd . It was never received into the canon, but yet was generally cited with respect only second to that which was paid to the authoritative books of the New Testament.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
HER'MAS (Mercury, the god of gain, and the messenger of the gods), a Roman Christian whom Paul greets, Rom 16:14. Some of the fathers attributed to him the book called "The Shepherd of Hermas," a sort of Pilgrim's Progress, consisting of three parts: the first has 4 visions; the second, 12 spiritual precepts; the third, 10 similitudes, each setting forth some truth.
Hitchcock's Bible Names (1869)
Hermes, Mercury; gain; refuge