The book of Matthew is most assuredly authored by Levi the tax collector, who when he became one of Jesus disciples no longer was called Levi, but was referred to by Jesus by his middle name which was Matthew.
Matthew - A.D. 55 Humanly speaking, the Bible was written by approximately 40 men of diverse backgrounds over the course of 1500 years. Isaiah was a prophet, Ezra was a priest, Matthew was a tax-collector, John was a fisherman, Paul was a tentmaker, Moses was a shepherd, Luke was a physician. gotquestions.org/Bible-authors.html#ixzz3NI4OkOCE Recommended Resources: The Quest Study Bible and Logos Bible Software.
The gospel according to Matthew was written by Matthew the tax collector. The gospel according to Mark was written by John-Mark. The gospel according to Luke was written by Luke the Physician. The gospel according to John was written by John the disciple that Jesus loved. o The Acts of the Apostles was written by Luke the Physician. blueletterbible.org/faq/authors.cfm
The human authors involved include approximately 40 writers of diverse backgrounds and locations over the course of 1,500 years. Isaiah was a prophet, Ezra was a priest, Matthew was a tax collector, John was a fisherman, Moses was a shepherd, and Luke was a physician. compellingtruth.org/Bible-authors.html#ixzz3NI9TBkBt –
It is not unusual for people to have their name changed when the begin the service of God. God changed Abram's name to Abraham, and his wife's name from Sarai to Sarah. And He changed Jacob's name to Israel.
Genesis 17:5 No longer shall your name be called Abram, but your name shall be Abraham; for I have made you a father of many nations.
Genesis 17:15 Then God said to Abraham, "As for Sarai your wife, you shall not call her name Sarai, but Sarah shall be her name.
Genesis 32:28 And He said, "Your name shall no longer be called Jacob, but Israel; for you have struggled with God and with men, and have prevailed."
When God planned to use someone in the Old testament for his purposes their names got changed sometimes by God himself and at other times by others such examples are:
Daniel 1:6 and 7 NKJV Now from among those of the sons of Judah were Daniel, Hananiah, Mishael, and Azariah. 7 To them the chief of the eunuchs gave names: he gave Daniel the name Belteshazzar; to Hananiah, Shadrach; to Mishael, Meshach; and to Azariah, Abed-Nego.