After posting the last message, I saw your first name.
My G-G-G-Grandfather's name was Dr. Daniel David Burget and my G-G-Grandfather was David Daniel Burget.
Also, something I didn't mention is that Burget/Burgetts seemed to have emigrated from Northern New York, down through Pennsylvania and into Ohio.The reason this would be is that Ohio was opened up for Revolutionary War Vets, and later, to the general public for homesteading.
In studing history, I know that the British Crown were called Hanovarian (sp?) (Germans!) and they had holdings in the Rhineland Palitinate...along the Rhine River.
The shipping trade from Britain to America took the British ships through the Carribean where they picked up ship worms that would eat the hull.The only way they could protect the hull was to "pay" (cover) the hull with pinepitch tar.The only way to get pinepitch tar was to chop down trees and burn the tar out.So who would the Crown get to do the dirty work?Get those Rhinelanders up and ship to Upstate NY!Fortunately (or unfortunately), they figured out that plating the bottom of the hull withcopper was cheaper, easier, and more long lasting.Pine tar went by the way and the Rhinelanders were pretty much cut lose.
There were other periods of large German immigration in the 19th century; after the 1820s; after 1849; and after 1880.All were times of significant political upheavals and consolidation in what is now the modern German state.
When your relatives came over would be hard to figure.
With my family I have to figure prior to the Revolution, because my G-G-G Grandfather and family were in Ohio and he was born around 1807.The "evidence" would seem to be circumstantial, but indicative.