I have several John Harrell. Here are just a few in simple tree:
Gen 1) Levi Harrell RS b abt 1750 Anson Co NC
Gen 2A) Asa Harrell b 1779 NC
Gen 3A) Mourning Harrell b 1835 possibly GA wed a Peacock
Gen 4A) Nancy Peacock b mother +20 abt 1855 wed a John Harrell no other info on him
Gen 2B) Levi Harrell II b 1777 NC
Gen 3B) William Holt Harrell b 1811 lived Pulaski Co GA
Gen 4B) Wright Harrell b 1839
Gen 5B) John Harrell b abt 1859 (father +20)
Gen 3C) same 3B)
Gen 4C) John Harrell died 1863 CSA Richmond VA
Did not see spouse surname in files but does not mean one of these not the same person.
I trace William Holt Harrell down to William Lewis Harrell and Charles Wright Harrell. I've only picked up a little on some of the other siblings of WHH. Also have several dozen with common first name John....