As a guide to Hessen geneological sources, surname patterns, etc., you may find "more than you ever wanted to know" at
http://members.cox.net/hessen
The webmaster at this site can be very helpful in answering your posts. Try to post your query in the place that fits your needs, simply and clearly, giving only as much as you know FOR SURE.
(If you have handy the current ZIP CODE for the location you are interested in and if possible the RELIGION of the people you want to learn about before you visit, you will save yourself some trouble there.)
Good luck!