At least 36 in Arizona.
http://www.whitepages.com/search/FindPerson?firstname_begins_with=1&firstname=David&name=Walters&where=AZ
Three listing in Surprise, Arizona.
http://www.whitepages.com/search/FindPerson?firstname_begins_with=1&firstname=David&name=Walters&where=surprise%2C+AZ
Pretty generic name.