"Blend of Ja and Marcus"
The name Jamarkus is commonly a male name.
Jamarkus is a modern American formation that joins an initial Ja- element to the established name Marcus, and the same combination is also recorded under the spelling JaMarcus. The name first appears in United States birth records in 1985, which fits a recent coinage rather than an inherited name from a documented language tradition.
The pronunciation of Jamarkus is juh-MAR-kus.