It's funny how one can set out to research a particular family, find a few records and walk away with little on that family, but all kinds of info on a "new" family line. After initially wanting to find as much as possible about the LANKAU family in Halberstadt, it was clear that this was not their home before the 1840s. The good news is that Halberstadt was the home to at least one ancestral family well before 1840 and church records have provided three new surnames.
There would be a fourth "new" surname, but I can't read the surname of Johanne Sophie Justine OEHME's mother, which was listed in Johanne's and David ARNECKE's 1829 marriage record. The name appears to be CAWE, but it could also be LAWE or LACOE. Other apparent instances of the name in the records seem to show it as LAUE, which at the moment I believe to be the most accurate.
I've had someone much better at reading German records take a look and they also are unsure of the actual spelling. It looks like I'll have to track down this woman's burial record by ordering one or two more rolls of microfilm in the upcoming months. (Unfortunately, her baptism and marriage record are not available on FHL microfilm.) Until this gets solved, I'll either hold off on making a page for the surname or temporarily create an "unknown" page.
[genealogy, Arnecke, Lankau, Oehme]