In the New Testament, there are four places where the disciples were named in list form: Matthew 10:2-4, Mark 3:16-19, Luke 6:13-16, and Acts 1:13. You may notice that the names tend to fall into blocks of 4 + 4 + 4 with the exception of Acts 1:13 where Judas Iscariot is dropped off the list leaving 11 names.
If you look at the last grouping of four you find the following:
In Matthew: James son of Alphaeus, and Thaddaeus; Simon the Zealot and Judas Iscariot, who betrayed him.
In Mark: James son of Alphaeus, Thaddaeus, Simon the Zealot and Judas Iscariot, who betrayed him.
In Luke: James son of Alphaeus, Simon who was called the Zealot, Judas son of James, and Judas Iscariot, who became a traitor.
In Acts: James son of Alphaeus and Simon the Zealot, and Judas son of James.
As you can see the thinking is that Judas, son of James and Thaddaeus are the same person. One complication, if you happen to be reading in the King James Version (KJV), is that in Matthew 10:3 of the KJV Lebbaeus and Thaddaeus are listed as the name of this disciple. This is because the set of Greek New Testament manuscripts available to translate from were much more limited at the time of the KJV (17th Century). Since then older copies of the GNT (not available at the time of the KJV) were found to only include the name Thaddaeus. If you explore the Greek for Thaddaeus (Strong Greek 2280) and Lebbaeus (Strong Greek 3002) you will notice the Greek letters for the two names are somewhat similar. Thus, Lebbaeus might have been a transcribing error that got into some later families of the Greek NT. Also with regards to information about the meaning of the names, only Thaddaeus has data further supporting the idea that Thaddaeus is the pertinent name to consider.
It is quite possible that with the betrayal by Judas Iscariot, the name Judas fell from favor. Thus, Thaddaeus, perhaps another name Judas son of James went by, eventually became his primary name subsequent to the betrayal.
A hint of this is seen in the one other place Judas (Thaddaeus), son of James shows up in John 14:22, Judas (not Iscariot) said to Him, “Lord, what then has happened that You are going to disclose Yourself to us and not to the world?”
As so let us learn to be like Judas Thaddaeus and bring our questions to Jesus!
It is likely that even though Jesus had been hinting and outright telling them he was going to suffer and die and be raised, the disciples didn’t really grasp this at this time. They probably still anticipated and wanted Jesus to be a highly public Messianic King figure. Thus, Judas wants to know why Jesus isn’t going to disclose himself to the whole world, why just them?
And so Jesus patiently re-interates God’s plans in v. 23, Jesus answered and said to him, “If anyone loves Me, he will keep My word; and My Father will love him, and We will come to him and make Our abode with him.
Jesus and the Father will disclose (come to him, make abode with him) to just the disciples who love Jesus and keep his word.
Thus, at the moment, we, frail human beings, partner with God in disclosing Jesus to the world by first responding to God’s disclosure to us, John 16:20-21, “I do not ask on behalf of these alone, but for those also who believe in Me through their word; that they may all be one; even as You, Father, are in Me and I in You, that they also may be in Us, so that the world may believe that You sent Me.
Next up, we will explore a disciple from the middle group of four.