Then again there is the surname Lnu, which can cause so much trouble because it stands for Last Name Unknown.
I have researched in courthouses, archives and libraries in ten different states and virtually, digitally, all over the country. I started in the Appalachian Basin doing oil and gas work, leases, rights-of-way and title cleanup, continuing with genealogical research, marriages, probate, partition deeds and now working through various genealogical and government web sites. There is almost no census entry I can't find. As record availability has evolved, so has my research. My research strengths, in addition to census and courthouse records are newspapers, migration, getting started, project management and brick walls.