Acts 1:13

And when they were come in, they went up into the upper chamber, where they were abiding; both Peter and John and James and Andrew, Philip and Thomas, Bartholomew and Matthew, James the son of Alphaeus, and Simon the Zealot, and Judas the son of James.

The upper chamber ... may not be certainly identified, despite persistent tradition to the effect that it was the place where the Last Supper was held, and that it was in the home of Mary, sister of Barnabas and mother of John Mark.

The list of the Twelve is given four times in the New Testament, in Matthew 10; Mark 3; Luke 6, and here. This list is like the others in that Peter, Philip, and James are recorded first in three groups of four each, of course, the name of Judas being deleted here. The mention of the apostles by name stresses that the Twelve (Luke would immediately record the replacement of Judas by Matthias) were on hand in Jerusalem, as Jesus commanded, waiting for the promise of the Father.

Simon the Zealot ... There is no reason for writing "Zealot" with a capital "Z" and then identifying Simon as a member of some revolutionary party which bore that name in 66 A.D. Acts was written before that name was so used;[18] and, besides that, "the name zealot can be used as a non-technical common noun."[19]

If one really wishes to know what "Zealot," as applied to Simon, actually means, he does not need to search any further than the word of the Lord. In both Mark 3:19 and Matthew 10:4, this apostle is called "The Cananean"; and as Bruce explained, "Cananean represents the Hebrew and Aramaic words for Zealot, which is of Greek origin."[20] Thus, Simon's native title, "Cananean," translates "Zealot" in Greek, the language in which Luke was writing; and being, himself, a Gentile, Luke did not bother to use the old Aramaic form as did Matthew and Mark. People who wish to make a revolutionary out of one of the Lord's apostles will have to find some other means of doing so!

[18] F. B. Bruce, op. cit., p. 43.

[19] Ibid., p. 44.

[20] Ibid., p. 43.