ChristianAnswers.Net WebBible Encyclopedia
Among the apostles there were two who bore this name:
Judas (Jude 1:1; Matthew 13:55; John 14:22; Acts 1:13), called also Lebbaeus or Thaddaeus (Matthew 10:3; Mark 3:18)
Judas Iscariot (Matthew 10:4; Mark 3:19). He who is called “the brother of James” (Luke 6:16), may be the same with the Judas surnamed Lebbaeus. The only thing recorded regarding him is in John 14:22.