Happy Christmas
Likely I did have notes with that sort of detail, and perhaps they still exist somewhere in the mountains of books, magazines, and papers spread from attic to basement in this house... the older the work in question, the more deeply buried the clues regarding it
Not many authors make extensive notes regarding supporting characters, or about anything else that doesn't fit into the immediate story to be told, for such material tends to become set in stone and limit the scope of possibilities for new tales. (I once asked Fritz Leiber for details of Pulg and got much the same sort of reply as I make above, and he added that his fans knew more about Lankhmar than he did
Yuletide best wishes,
Gary