Palishade- palisade and shade
Duskade- dusk and blockade
Enki- from the Sumerian texts, meaning a being who appeared from a void (suggesting it actually be named "Enki the Gorilla", as well.)
Your Yanny is someone's Laurel
Something bold or savage because he looks intense, like grash
or something completely opposite of what he looks like, maybe petal
OR musa because musa point of karamja, but musa isn't really focusing on his shadow aspect
i fill like muka, gangash and bash wouldn't be a bad name for a gorilla either, but i think ive heard them somewhere before and just cant remember ¯\_(ツ
_/¯
so really your best choice for the gorillas name is Sullivan, because who wouldnt want a gorilla named Sullivan