"Blend of Da- and Marcus"
The name Damarkus is commonly a male name from the "American" origin.
Damarkus is a modern American formation that attaches the prefix Da- to Marcus, the Roman name also spelled Markus. It first appears in United States birth records in 1989, and no earlier use in another language or naming tradition is recorded for this spelling.
The pronunciation of Damarkus is duh-MAR-kus.