Thaddaeus

2 verses

Matthew

Philip, and Bartholomew; Thomas, and Matthew the publican; James the son of Alphaeus, and Lebbaeus, whose surname was Thaddaeus;

Mark

Mark 3:18

And Andrew, and Philip, and Bartholomew, and Matthew, and Thomas, and James the son of Alphaeus, and Thaddaeus, and Simon the Canaanite,

From Easton's Bible Dictionary

Matthew George Easton, 1897

Breast, the name of one of the apostles (Mark 3:18), called “Lebbaeus” in Matt. 10:3, and in Luke 6:16, “Judas the brother of James;” while John (14:22), probably referring to the same person, speaks of “Judas, not Iscariot.” These different names all designate the same person, viz., Jude or Judas, the author of the epistle.