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Here's a mnemonic sentence that recalls the names of the twelve disciples chosen by Jesus Christ to go out and preach the Gospel on his behalf:

"Bart and John fill Tom's mat
with 2 Jams, 2 Juds and 2 Simons."

Bartholomew, Andrew, John, Phillip, Thomas, Matthew, James The Great, James The Less (aka. Thaddaeus), Judas (aka. Jude), Judas Iscariot, Simon Peter, Simon Zelotes.

Varying descriptions in the four Gospels of the New Testament can create confusion over some of the names. Descriptions are chiefly found in Mark III (14-19), Matthew IV (18-22) and X (2-4), Luke V (2-11) and VI (13-16), and John II (40-44) and VI (66-71). None of the apostles wrote any of the books of the Bible.

Theologians generally summarise the apostles as being:
Simon (aka. Peter) and Andrew, brothers, fishermen sons of Jonas. Christ renamed Simon as Simon Peter.
James (aka. James The Great) and John, brothers, fishermen sons of Zebedee and partners of Simon. Christ surnamed both as Boanerges.
Phillip of Bethsaida, and Bartholomew.
Matthew, a publican.
Thomas, soon nicknamed Doubting Thomas.
James (aka. James the Less, also called Thaddaeus or Lebbaeus) and Judas (aka. Jude), brothers, the sons of Alphaeus.
Simon Zelotes, the Canaanite.
Judas Iscariot, who eventually betrayed Christ.

Here's an alternative mnemonic giving their names in the form of a "Sunday School" rhyme:

This is the way the disciples run
Peter, Andrew, James and John
Philip and Bartholemew
Thomas next and Matthew too
James the less and Judas the greater
Simon the zealot and Judas the traitor