There’s a disciple we don’t talk about much. The Gospel authors didn’t talk about him much either, so I guess we can be excused. Matthew and Mark call him Thaddaeus. Luke and John call him “Judas son of James”* or “Judas (not Judas Iscariot).” Yes, with the parentheses (Luke 6:16 and John 14:22, respectively). In other words, the other Judas.
It was such a common name; in fact, Jesus had a brother named Judas (Mark 6:3). Thaddaeus sounds like a Greek name to me,** so I’m guessing Matthew and Mark used this name (or nickname) to avoid the need for further definition. Matthew was obviously comfortable with alternate names since he’s also called Levi.
I would hate to be that other Judas.
On top of the confusion with his name, we only have one documented interaction between him and Jesus, and it doesn’t make our Judas/Thaddaeus look so good.