After further consideration, I must say that I do not like the idea of extending Data Doctors unique-name checking to Last Names, and particularly not to Other Last Names (suggestion 797).
Indeed, although I believe I am the member who first made the suggestion to check for misspelled first names, I propose that it is time to eliminate the Unique Names checking feature, except for newly created profiles.
Years ago when I proposed name checking, I was seeing profiles (mostly GEDCOM-created, back when GEDCOMs were imported in batch mode) with odd first-name spellings that I was rather sure were common names that were misspelled due to typing mistakes (consider a spelling like Behjamin or Benjamni). The Unique Names db error has been effective in eliminating a great many errors like those. Where such spellings are seen now, it probably is because the profile creator says the spelling is correct. Now that GEDCOM profiles need to be individually reviewed, I think the probability of these types of errors in new profiles is lower than it was in the old days, but I do see benefit in retaining this kind of checking for profiles created within the previous year.
Last names are a different situation. Weird undetected typing mistakes are less likely in last names because people generally pay more attention to the spellings of their ancestors' last names than they do to their first names, and because last names typically get replicated to other family members, there is less chance for one-time typos. Furthermore, because the Other Last Names field is not auto-populated by Gedcoms and is mostly used by experienced WikiTreers, there is a relatively low likelihood of simple typing errors and a very high likelihood that any unusual spellings were entered deliberately after checking and double-checking the source(s). Therefore, DB-797 can be expected to detected very, very few invalid spellings. It can, however, be expected to cause experienced members (such as Isabelle, Bobbie, and me) to take time away from work that most of us consider far more important for the quality of WikiTree.