http://www.babynamewizard.com/baby-name/boy/grady
You are probably wondering why I named my fantasy world Gradaia. I essentially named it after myself, Grady. After doing research on the origin of my name, I discovered that “Grady” is a Gaelic or Irish word for “Noble or Illustrious One”. “Grady” is a common name in my family because it is my father’s name and his father’s before him. If we were kings I would be Grady III. If I had a son I would name him Grady IV. So I tinkered with my name until I was able to make it sound like the name of a fantasy world.
Grady P Brown - Author 
That’s super cool! I love when authors put in significant details like this into their own work. It makes the story more personal and interesting, I think.