I haven't found anything for years on my Lewellen family and I have an apple box of "stuff" concerning these people. I decided it must be time to type it somewhere so that others can see it and add/correct the data.
The first real record of this part of the family is the Titheable record of Loudoun County, Virginia. According to the year a man first was accountable for the tithe [basically age 21], the record is something like this; many of these were on the record for some years afterward:
1759 Samuel Lewellin 1760 Shadrick Lewellin 1761 Thomas Lewellin Sr 1762 Philip Lewellen 1763 Thomas Lewellen Jr 1768 Francis Lewellen 1773 John Lewellen 1776 Doctor Lewellen 1783 Isaac Lewellen