I've started a project cleaning up my database. Whenever I finish a letter of the alphabet, I'll write a blog post to report about what I learned about the surnames that start with that letter.
The letter Y gave me no problems. It helps to have only 4 people with a Y surname in your database. I did delete one of them though. I had added a father to Mary Margaret Young based on a cousin's research. But since it didn't have any sources, I deleted him.
One more letter to go!