I don't believe there was any meaning to the addition or deletion of the "e".It only reflects the many cultural backgrounds, variances in the amount of education of the individuals keeping early records and the lack of standardized spelling in early America.
Have seen official documents in which an ancestor's name will be spelled three different ways within the same document.Such as "Murphey", "Murphy", Mirphey". Although foreign to our current way of thinking, standardization of spelling was obviously somewhat irrelevant in the drawing up of these documents.
I don't have any statistics to quote, but it appears that a very large portion of the population could not read and write based on the number of "X's--his mark" used as a signature in legal documents.
Guess they were busy settling the land, fighting wars and disease and generally trying to survive.