Ary A Herrin
The earliest grave marker I know of in the May Cemetery is for Ary A Herrin.

MARKER

 The marker is broken and the date hard to read. I believe she died January 31, 1836. She was born in May 31, 1816. The marker states she was the wife of C. J. Herrin.

Ary A Herrin (1816-1836) - Find a Grave Memorial
 
C.J. Herrin is  Charles Joel Herrin Charles Joel Herrin (1804-1889) - Find a Grave Memorial

According to family members Charles Joel Herrin was a close friend of Daniel May [May102] or his son Frederick.