Reference: Thaddaeus
Easton
breast, the name of one of the apostles (Mr 3:18), called "Lebbaeus" in Mt 10:3, and in Lu 6:16, "Judas the brother of James;" while John (Joh 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.
Fausets
Hastings
This is the name of one of the Twelve Apostles as given in Mt 10:3; Mr 3:18. He is doubtless to be identified with the 'Judas [son] of James,' who appears in the Lukan lists (Lu 6:18; Ac 1:13; so RV, but AV renders 'brother of James'), and with the 'Judas, not Iscariot,' of Joh 14:22, though some Syrian writers have made this last Judas to be the same as the Apostle Thomas (syr reads here 'Thomas,' syr reads 'Judas Thomas'), Thomas being confessedly only a surname, 'the Twin.'
In all four lists Thadd
Morish
Thaddae'us
See JUDAS No 2.