Row 2: 2-1 Lindsay, Isabelle E. Aug. 12, 1834-April 8, 1904
2-2 Lindsay, Johnza Born Jan. 15, 1801, Died Jan. 6, 1879 Aged 77y, 11m, 22d Lindsay, Mary M. Porter-wife of Johnza Lindsay Died March 26, 1880 Aged 73y, 5m Gone Home Father Mother Quietly sleep, beloved ones, Rest from thy toll, thy labor is done. Rest, till the trump from the opening skies Bid thee from dust to glory arise.
2-3 Lindsay, Wm. A. Died Jan. 10, 1855 Aged 17y, 6m, 17d
2-4 Zellers, Sarah A. Lindsay-wife of Elijah O. Zellers Feb. 4, 1826-April 5, 1865
The 1860 census has this information about Johnza Lindsey:
Name: Jno Lindsey [Johnza Lindsay] Age in 1860: 59 Birth Year: abt 1801 Birthplace: Maryland Home in 1860: Middletown, Logan, Illinois Household Members: Name Age Jno Lindsey 59 Mary Lindsey 53 Sarah Lindsey 33 Isabel Lindsey 23 Geo Lindsey 16
So from this is seems that all the listings you have for the cemetery were part of Johnza Lindsey's family, except perhaps for William A. Lindsey.William died in 1855, so he might have been a son of Johnza too.I did not collect any census data for Johnza in 1850.