There are a number of LeFevre family members in Loudoun County. Part of my family married into the LeFevre family. You may want to look at the web site
http://www.loudoun.k12.va.us/schools/hillside/history/histor... for an interesting look at some history - courtesy of my cousin Ann Hennings. Which of your Samuels served in the Confederate Army? If so, then his grave site (b. 1828, d. 1904) is at the Broad Run cemetery in a preserved area of the Broadlands development - I have photos if you are interested. Also, the Shryock family is prevalent in the area.