The names you mentioned is very common in the Rowan County/Davie county Eatons. But the head of the clan, Peter came from Pennsylvania. The only Jonathan mentioned, is listed in the tax records last in 1768. no more inf. there are Eat=tons mentioned as living in KY in.
joseph, 1810 Woodford County, Samuel in Clark Count in 1806,
Again, it seems that Maryland is not mentioned in the book.