Actually MO is one place where the Kooken name can trip you up.
The Kooken name, 2 o's, is alledgedly Dutch and they came to the colonies in about 1730.The progenitor was Johannes, he had 5 sons, and after the War, they started their westward migration from near Allentown PA heading west, as did many families.By about 1860 they were in MO, and most but not all connect back to Johannes.
A number of Kookens (double O) did change their name to the single O spelling-- it was easier and phonetically more accurate. Some also changed to Cogan, same reason.
However, in the 1850's a family of Kokens-- single O-- came from Germany, his first name escapes me on the moment. They came thru New Orleans and ended up in MO where the founded, in time, the Koken Manufacturing Co, pictures of which I have seen, that became famous as the premier manufacture of barber chairs. In the mid 1900's, almost every barber chair was a Koken.They sold out some time ago.I think the later 1900's was bad for barber chairs.
So you could be one or the other. If you have an earlier ancestors name, I might be able to find something in the files that ties you into our line-- the double O's.