How can you find someone if you know his first and middle names, mom's maiden name, and father's full name? We have his DOB, but don't know exactly where (incl. state) he was born or graduated. I've tried searching using his mom's maiden name and using his dad's name, since we have no idea which name he goes by.

I'm trying to help my sister in law find her half-brother that she's never met and her maternal family has only seen once, so there's not much info. Any help is appreciated.

Is it a very common last name,

Unfortunately it is common from the searches I've turned up. We do know a couple of states that he's lived in, but I haven't had a lot of luck that way, either.

Try the LDS website. Then our call the LDS church in your county. They have a lot of records.