If you are writing a book, it is always a good idea to keep a running list of terms you use in a way that may be outside the dictionary norm.
If you are writing fiction you can keep a running list of the way you spell names of people, towns, streets, etc. That way you will always spell them the same way and maintain consistency. That becomes especially important if you are writing about a fictional world. (Can you imagine J.K. Rowling trying to keep track of all the details of Hogwarts as she was writing Harry Potter if she hadn’t kept notes?)