Colossians 4:7

Tychicus : a man who was a fellow worker with Paul

Colossians 4:10

Aristarchus : a man who accompanied Paul on his third missionary journey

Barnabas : a man who was Paul's companion on several of his journeys

Mark : a nephew of Barnabas and companion of Paul; author of the Gospel of Mark

Colossians 4:14

Demas : a man who worked with Paul and later deserted him

Luke : the man who wrote the book of Luke and the book of Acts