There are several lines of Ackermans which started out with different spellings and come from different countries. Some of which are Akerman, Ackerman, Ackermann, Akkerman, and more. Countries inclued England, Germany, Holland, Russia, and Switzerland. Some or all of these ended up as Ackerman. My line starts out with Akerman possibly from Germany and now we are Ackerman. I'm told that it use to be Ackerman and the c was dropped. If you can you give us more info on your line someone may be able to tie your line in with theirs which will help both parties.