Who was the Twelfth Disciple?

Here is Shane's next question:

Here's another question, who was the twelfth disciple?

According to 10:2-4
-Mark 3:16-19
The twelfth disciple was Thaddaeus.

According to Luke 6:14-16
The twelfth was Judas (son of James).

According to John 21:2
The twelfth was Nathaniel.

The other eleven were, Peter, Andrew, Philip, James, Bartholomew, John, Thomas, James, Matthew, Simon, Judas Iscariot.

Shane, are you really sure? Let's compare the lists:

Matt 10:2-4
Simon (who is called Peter) and his brother Andrew; James son of Zebedee, and his brother John; Philip and Bartholomew; Thomas and Matthew the tax collector; James son of Alphaeus, and Lebbaeus, whose surname was Thaddaeus; Simon the Zealot and Judas Iscariot,

Mark 3:16-19
Peter,  James son of Zebedee and his brother John (to them he gave the name Boanerges, which means Sons of Thunder); Andrew, Philip, Bartholomew, Matthew, Thomas, James son of Alphaeus, Thaddaeus, Simon the Zealot and Judas Iscariot

Friom Luke 6:14-16
Simon (whom he named Peter), his brother Andrew, James, John, Philip, Bartholomew, Matthew, Thomas, James son of Alphaeus, Simon who was called the Zealot, Judas son of James, and Judas Iscariot

From John 21:2
Simon Peter, Thomas (called Didymus), Nathanael from Cana in Galilee, the sons of Zebedee, and two other disciples were together. (at least 7 men)

Matthew and Luke agree with number of people and the names used. Luke is different, and I will deal with Luke in a moment. John 21:2 cannot be compared to the other passages because it is not attempting to name the 12. It lists only 7 people not 12. Therefore no way could John be trying to name the twelve...and Jesus had more more disciples than just those twelve. Besides this is after Judas Iscariot....um... moved on to where he belongs.

As for Luke's differences. Thaddaeus was also known as “Judas, son of James” (Luke 6:16) and Lebbaeus (Matthew 10:3 KJV). Simon the Zealot was also known as Simon the Canaanite (Mark 3:18 KJV). (http://www.gotquestions.org/twelve-apostles-disciples-12.html)

Recall that in the first century many Jews went by a Jewish name and a Gentile name. Like Paul's Jewish name was Saul. Mark's Jewish name was John.  Judas is the Greek form of the Hebrew name Judah. Thaddaeus is a Greek from of an Aramaic name. One way to refer to him would Judas (or Jude) Thaddaeus. Matthew and Mark used his last name, Luke used his First name. There is no conflict here.

Why would you, Shane,  think that this is conflict?

Update: I did a little more digging. The Greek word for "brother" (aldophus)  is not in the text of Luke 6:16. I saw a translation that says Judas was a relative of James. When I examine the text the word translated "son of" in Luke 6:16 is 'IakoBou (sp) which means in the context of the verse mean "of James". The word is used in verse 15 where it says that  apostle James is the "son of Alphaeus". Why change the meaning of the word in verse 16? It shouldn't..