Thaddaeus

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.