Hello Carol: I too have a great many LUECKEs in my family tree. One is Heinrich Ludwig LUECKE born Feb. 3, 1822 and died March 5, 1907. He had married Sophia Anna HEUER and had at least six children...Dorothea, Henrietta, Johanna, Christian, Carl and Ernst.
This is the closest I have to your gggrandfather Heinrich. They had all settled in the area of northern Sheboygan County which is adjacent to Manitowoc County. Maybe one of my Heinrich's relatives may also be in your tree. His siblings were Alwin, Louise, Friederich, Ludwig and an unknown sister. Coincidently...Ludwig's middle name I believe was also Heinrich...Ludwig had a daughter named Wilhelmine...but I have this Wilhelmine married to a Friederich Martin HIDDE.
I would politely suggest that you find some type of birth, marriage or death certificate for your LUECKEs mentioned. This to concretely establish the LUECKEs name and ages. As you can see, they used just a few names for their first and middle names...Then they even went by some nicknames because another relative had to similiar of a name. Yes ! They did not think of the researcher's headaches.
I have never found many LUECKEs in the Manitowoc area. I would kindly suggest you look further into Sheboygan unless you have firm evidence disproving my suggestion. One absolutely great source is the people at the Sheboygan County Historical Research Center in Sheboygan Falls or www.SCHRC.org
. They have some of the best files and some of the least expensive researchers a genealogist could want to find.
I have more than 75 LUECKEs or LUCKEs in my tree. In fact, the main home of my childhood is one of the original homes of my LUECKEs which was built in the 1850s. I have traced them back into the 1700s and would be happy to share with you.