"Blend of Tre and Shawn"
The name Treshawn is commonly a male name from the "American" origin.
Treshawn is a modern American formation built from two familiar elements: the Tre- prefix found in names such as Trevor and Tremaine, and Shawn, the English spelling of Irish Sean. Both parts are long established, but the combination itself has no earlier history; it first appears in United States birth records in 1988. The spelling with -shawn places it alongside other Tre- names coined in the same period.
The pronunciation of Treshawn is truh-SHAWN.