"Form of Cheyenne"
The name Shyenne is commonly a female name from the "Native American" origin.
Shyenne is a phonetic respelling of Cheyenne, the English name for the Native American people, with the opening Ch- written as Sh-. It is a spelling of that name rather than a separate name with its own meaning, and it entered United States birth records in the late 1980s, well after Cheyenne was already in use there as a girl's given name.
Cheyenne means "An Algonquian tribe of the Great Plains. Capital city of Wyoming.".
The pronunciation of Shyenne is shy-EN.