I do have Robert Lewis Hunter, although his wife, I have, is Mary W. Jarrell, daughter of Lemuel Coffey and Julia Ann Jarrell. She was born on 29 Nov 1857 in Raleigh County, then, Virginia. They had nine children together.
Robert Lewis Hunter has 5 siblings, he being the sixth child of William Hunter and Mahala Pettry. William, born in 1817, was the son of Robert Thompson Hunter and Elizabeth Taylor.
Robert H. Hunter was also a son of Robert T Hunter and Elizabeth and was born Mar 1825 in Giles County and died in 1910 in Tazewell County. Robert H. Hunter and your William were brothers.