Appendix:Names derived from Marcus
Marcus is a Latin first name associated with the Roman clan name Marcius and the Roman god of war, Mars. It is usually said to mean "martial" or "great warrior".
In the thirteenth century, the Venetian Marco Polo visited the court of Kublai Khan and brought back the first accurate description of China. The name was introduced in England about the same time, but it was seldom used until the 1800s, when it was adopted in Britain and the United States.
The widely known American author Mark Twain (Samuel Clemens) took his pen name not from Mark but from an expression used by Mississippi riverboat pilots. It dropped from fashion early the 20th century, but then in the 1960s it began a strong revival.