The answer is found in Mark 13:16-19.
The 12 are:
Peter (Simon) and Andrew - brothers
James and John - brothers
Philip
Bartholomew
Matthew
Thomas
James - son of Alphaeus
Thaddaeus
Simon - the Cananite
Judas (the betrayer of Jesus)
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12
Jesus had 12 Disciples
Beside the 12 disciples that followed Jesus there were many disciples mentioned, in fact too many to mention. Their names are found in almost all the books of the New Testament.
A disciple is a follower of Christ. An apostle is one who is set apart or ordained as a leader is Christ's church. There were, and are 12 apostles to serve in Christ's church. There are millions of "disciples" or followers of Christ.
They were all Jewish men.