The same as Judas.
Among the apostles there were two who bore this name,
(1) Judas (Jude 1:1; Matt. 13:55; John 14:22; Acts 1:13), called also Lebbaeus or Thaddaeus (Matt. 10:3; Mark 3:18); and
(2) Judas Iscariot (Matt. 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.