"Blend of Mar and Shaun"
The name Marshaun is commonly a male name from the "American" origin.
Marshaun is a modern American name built from the Mar- element found in names such as Marcus and Marquis, joined to the Shaun element seen in names like DeShaun and RaShaun. It first appears in United States birth records in 1970, and no earlier use in a documented language tradition is recorded for it, so no inherited meaning can be given. The spelling Marshawn is also in use in the United States.
The pronunciation of Marshaun is mar-SHAWN.