You may have already found this information, but the 1930 Census lists your family Fitzhugh Wells living in Richland Magistrate (Rural District) of Wise County. The family is listed as: Fitzhugh.36, Nannie.31, Irene.12, Eugene.10, Blanche.8, Dorothy.4, Thomas.2 9/12, Frances. 7/12 and living with them is Fitzhugh's father, Preston, age 78.
We also found Fitzhugh in the 1910 census living in Clintwood, Dickenson Co., VA. He is 18 and is listed as the stepson of O.L. Phipps. Susan is listed as O.L. Phipp's wife.
The Statzer Family History by Bill Statzer of Wise County lists Z. F.'s name as Zachariah Fitzhugh Wells. This book was compiled in 2003 and is currently available.