I did try Howton as a wild card search to make sure all spellings were included; also "Houghton".
Did you contact Yates Publishing to find out their source?
Family Group Sheet Exchange
Bill Yates, Yates Publishing, P.O. Box 67, Stevensville, MT, 59870. Or contact him toll-free at 888-377-3797 or via e-mail at firstname.lastname@example.org
"The Millennium File"
Salt Lake City
Is the Jonathan Howton you're researching arrive from London at New Orleans in 1773? He was 16 years of age? After marriage he and his wife had two daughters and seven sons? Or is this a different J. Howton you are researching?