Mass Delete Users Via SQL?

I have used the User Import module to upload several users into my site. A good portion of those users already existed, and so the UI module added those same users plus several numbers. I would like to delete all these users that have the extra numbers.

For example, the following accounts exist in my site:

BobSmith (The original that already existed before my import)
BobSmith2
BobSmith22
BobSmith222
BobSmith2222
etc.

I don't know why the account was added so many times, and I need to delete these extra accounts containing all the extra numbers. Is there a way I can do this with a sql statement in PHPmyadmin rather than going screen by screen in the user management area?

Any help is greatly appreciated.