The origin of the name Marcus is Greek
This is how Marcus is written in Greek
Μᾶρκος = Markos
The biblical meaning of the name Marcus is a defense.
Marcus was the author of the Gospel of Mark. Marcus was his Latin surname, his Jewish name was John
The name Marcus appears in the bible in the following verses:
Acts 15:37 KJV
And Barnabas determined to take with them John, whose surname was Mark.
Acts 15:39 KJV
And the contention was so sharp between them, that they departed asunder one from the other: and so Barnabas took Mark, and sailed unto Cyprus;
Colossians 4:10 KJV
Aristarchus my fellowprisoner saluteth you, and Marcus, sister’s son to Barnabas, (touching whom ye received commandments: if he come unto you, receive him;)
Philemon 1:24 KJV
Marcus, Aristarchus, Demas, Lucas, my fellowlabourers.
1 Peter 5:13 KJV
The church that is at Babylon, elected together with you, saluteth you; and so doth Marcus my son.