New Defender's Study Bible Notes
10:3-4 Thaddaeus; Simon the Canaanite. Thaddeus is also called Judas (Luke 6:16), and Bartholomew is probably the same as Nathaniel (John 1:45-49). Simon the Canaanite is elsewhere called Simon the Zealot.
The names of the disciples are combined in pairs, probably because it was by these pairs that they were sent out “by two and two” (Mark 6:7) on this first missionary assignment.