According to Google Insights, Doctor Octagonapus is a more popular search term than Doctor Octogonapus (except for four months in late 2009/ early 2010). For the partial month of July, Doctor Octagonapus is at 94, while Doctor Octogonapus is at 0. I’m going to side with the more popular spelling variation.
Doc
Jul 21, 2010 at 11:44AM EDT0