I have seen Shinnae, Shinae, Shin'ae, Shinea and other similar names pop up alongside the more popular name
Shanae. (I have also seen Shannae, Shanay, Chenaey and various other forms). They're all the same name, with different sets of letters representing the shə-NAY pronunciation.
Shanae seems to be a modern coinage, possibly based on
Sian /
Shana, or
Shannon, or
Chanel, or anything else with 'shan' as the first syllable.
http://wonderingchristine.blogspot.com/