or Cai'us (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.)
- John's third epistle is addressed to Christian of this name. We may possibly identify him with No. 2.