The list you sent only goes up to 1952. It was posted on the internet in 2000. I can also tell you that this list is far from complete. There are thousands more burials that took place from the time of the cemetery's inception up to 1952 and since then. I know because I was raised in Rahway and worked in the cemetery when I was in High School back in the early '60's.
I don't know if you are aware of it, but there are also many Brown's buried in Hazelwood cemetery including a Civil War General.
The only FitzRandolph in my family tree is Sarah, daughter of Hartshorne FitzRandolph who married John Marsh in the 1700's. He was one of my relations. The FitzRandolph's are a rather prolific family as I'm sure you have discovered.
FYI, I checked the cemetery records that are on-line for Mount Moriah Cemetery in Philadelphia and VanSickle's name does not appear there. In all probability, due to the proximity of Rahway to Philadelphia, his body was more than likely returned to Rahway for burial after the war ended in 1865.