The name Marcus is a boy's name of Latin origin meaning "warlike". Marcus is ranked #195 on our popularity charts and is often added to lists like Cool Boy Names From Ancient Cultures and discussed in our forums with posts like "Drop Your Least Favorite - B/G Twins with middles".
From the experts:
Though ancient, Marcus now sounds more current than Mark, in tune with today's trend towards us-ending Latinate names.
Marcus was commonplace in classical Rome--not surprising as it was one of only about a dozen given names in use then. Among the most prominent were the emperor and stoic philosopher Marcus Aurelius, the Marcus known to us as Mark Antony, and the politician, philosopher and orator Cicero.
Dr Marcus Welby was a staple on vintage TV, and since then we have seen the name in both the Harry Potter and Twilight franchises, as the protagonist of Nick Hornby's About a Boy, on Sons of Anarchy and Men of a Certain Age, and in Indiana Jones, The Blind Side, and Bad Santa.
Marcus Loew was the movie magnate behind MGM and Loew's theatres, and Marcus Allen was an Oakland Raiders superstar.
Marius is a related possibility.