Jennene is of American origin, derived from Jennifer. It means "graceful". The variant spelling was popularized by the character Jennene Carris in the television series "Ryan's Hope" during the 1970s and 1980s.
"The name Jennene experienced periods of popularity with a noticeable spike in the late 1950s and early 1960s, followed by a steady decline from the mid-1960s onwards."