Not sure if May is the first name but from middle name and 1840 census it appears this is a son.
1850 Letcher Co., KY census: Aged 12 living with parents and 7 siblings. (SV-1069)
1860 Letcher Co., KY census: Aged 78 living with Mary (28); Esther (24); May (20); Mary (15); James (11); Sarah (32); Manerva (8); Henry (6); Joseph (4); Jane (2). (SV-1071)