Verses with the word marcus in the New Testament (3 verses):

Colossians 4:10
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
Marcus, Aristarchus, Demas, Lucas, my fellowlabourers.

1 Peter 5:13
The church that is at Babylon, elected together with you, saluteth you; and so doth Marcus my son.