Easton's Bible Dictionary (1897)
Reminding, or remembrancer, a Christian of Jerusalem with whom Paul lodged (Acts 21:16). He was apparently a native of Cyprus, like Barnabas (11:19, 20), and was well known to the Christians of Caesarea (4:36). , he had become a Christian in the beginning of the formation of the Church in Jerusalem.
Smith's Bible Dictionary (1863)
(remembering) is honorably mentioned in Scripture. (Acts 21:16) It is most likely that his residence at this time was not Caesarea, but Jerusalem. He was a Cyprian by birth, and may have been a friend of Barnabas.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
MNA'SON (remembering), a native of Cyprus, but a resident of Jerusalem, was an early convert to Christianity, and is mentioned. Acts 21:16, as the host of the apostle Paul.
Hitchcock's Bible Names (1869)
a diligent seeker; an exhorter