DeMarcus \d(e)-mar-cus, dem(a)-rcus\ as a boy's name. Modern name: Marcus with the prefix De-. Marcus sounds like Marquez, though they are from different roots.
DeMarcus has 9 variant forms: Damarcus, DaMarkiss, DeMarco, Demarkess, DeMarko, Demarkus, DeMarquess, DeMarquez and DeMarquiss.
Baby names that sound like DeMarcus are DeMarcos and Damarco.