Gaius

Smith’s Bible Dictionary · William Smith, F. N. Peloubet, M. A. Peloubet

or Caius (lord)--

A Macedonian who accompanied Paul in his travels, and whose life was in danger from the mob at Ephesus. (Acts 19:29) (A.D. 54.)
Of Derbe. He went with Paul from Corinth in his last journey to Jerusalem. (Acts 20:4) (A.D. 54.)
Of Corinth, whom Paul baptized and who was his host in his second journey in that city. (1 Corinthians 1:14; Romans 16:23) (These are supposed by some to be only one person.)
Johns third epistle is addressed to Christian of this name. We may possibly identify him with No. 2.

In other dictionaries

William Smith; revised by F. N. Peloubet and M. A. Peloubet; CrossWire SWORD module Smith 1.3

Bible Strong digital edition from CrossWire module 1.3, based on the 1884 Peloubet revision with later digital enrichments preserved