"Variant of Keyshawn"
The name Keyshaun is commonly a male name from the "American" origin.
Keyshaun is a modern American spelling of Keyshawn, using the ending -shaun where Keyshawn has -shawn, the same pairing found in Shaun and Shawn. Shawn and Shaun are anglicised forms of Irish Sean, which shares its source with English John. The name belongs with American coinages such as Keshawn, DeShawn and LaShawn that place an unstressed syllable before Shawn.
Keyshawn means "Combination Of Key And Sean".
The pronunciation of Keyshaun is KEE-shawn.