Probably a modern blend of Cheryl or Sher- with -lena, combining familiar name elements.
Sherlena is probably a modern blend of Cheryl or Sher- with -lena, combining familiar name elements into a smoother feminine form. That makes it feel intentionally assembled rather than inherited from one fixed historical line.
The name has a soft, stylish sound and a distinctly mid-to-late twentieth-century American flavor. Sherlena feels graceful without being ornate, and its blend structure gives it flexibility and personality. It reads as modern, affectionate, and designed for melodic flow.