Common:
* Janelle (most common)
* Janell (a less common variation, but still acceptable)
Less Common:
* Gianelle (This variation is used less frequently and is often considered more unique)
Other possible spellings:
* Jeanelle
* Jannelle
* Janellé
However, it's important to note that these less common spellings might not be recognized by everyone and could cause confusion.
Ultimately, the best way to spell the name is how the person who bears the name prefers it.