Alright! I'll copy-paste an explanation I gave prior on Reddit. I legit had no idea this would spark so many conversations hahaha.

"I like to use a pen name generator, and use the generated name for my projects. It makes it easier for me to name things, rather than having to come up with new naming ideas for every new project. And also, I like the idea that every project has a person's name, as if, by using the project, you're getting the help of the person named X (X = Isaiah, Erin, Osmond, any other project I have published)."

I really had never thought of the religious aspect of Isaiah, I just went with a generated pen name I liked.