"...George Kohler, was Lutheran, and took his naturalization oath on September 4, 1764, in Frederick County, Maryland. More research is being done to find where in Germany he came from and what ship he arrived on."

For her reference material Dee lists:
Colonial Maryland Naturalizations, Jeffery A. and Florence Wyand, page 49.
Dee's notes from this source include the following information:
Colonial Maryland Naturalizations,  253  September 12, 1765 September 4, 1764 DD-6, 281

CATHERINE KAYLER
The following information was found on the Maryland State Archives site, specifically http://www.mdarchives.state.md.us/msa/stagser/s1500/s1527/html/ssi1527k.html. It is part of the Maryland Marriage References section:

Kayler, Catherine, dau. of Jacob. of Fr Co., m. by 1793, Andrew Lennard (Fr Abstracts of Deeds 1:332).