Dermo
I don't have the answer to information re who is buried in each grave, but at a guess, the Church in Hollywood most likely holds a cemetery register covering this. I suggest you write to the church and if they haven't got this information, I am sure they will be able to tell you who to contact.
The name and email address of the person who contributed that last item can be found at the top of the Text Page on IGP Archives. You might like to get in touch with him. This headstone was missed when we worked on the Headstones at Hollywood, and I am aware that a few more in this section of the graveyard may also have been missed. I hope to get back there once we have some nice Spring weather, and will watch out for your names.
In the meantime I will take a look at the other names you have listed, and will get back to you later. Do you have any rough dates of death and forenames etc.
Best wishes
Joy