Thudt /Kellner

Dear Listers:
I am looking for any information on Johann THUDT and his wife Sara KELLNER. Saran was from Elsaslothringen while Johann was for SA. The Thudt family has been in Germany for 800 years then later moved to Romania ( Transylvania)
   I know this is very little information. What makes this even harder for me is not being able to read or speak German.
So if the THUDT are in your family tree or the KELLNER I would love to hear from you.
Sheila