Fehmarn- Kehm married Scharf

Hello,

Gruss Bärbel (Kühn)
I have a Wilhelm Kehm born 30 June 1816 in Bibdsachsen; married 21 Dec 1840 in Bindsachsen, Hessen to Anna Maria Scharf.
I'm looking for the birth and death dates and place for Maria and her parents. I have her parents names if this would help.
I'm not sure if [Kuhn] is the same name as Kehm??
Thanks for any help and time you can give me.
Ellanor Phillips