Most people (70 percent) are buried in family plots. Use this BillionGraves Plus feature to find headstones with the same last name. 

From the Life Information Page***

Step 1:To see family plots throughout a cemetery, scroll down the page and click on "See High Precision GPS". 

Step 2: Family plots are in orange.  Click on the arrow and you can see all graves in the cemetery with the same surname. 

In this example you can see family members buried together in a cluster of orange pins.  There is also another pin further away.  This is a grandchild of those buried in the cluster.  The blue pins are nearby graves.