The study starts with a location, where certain first names are a constant repetition over and over again for generations. This is the reason in our Hunter surname you will find the first names John, James, Samuel, William, Robert and Hugh to name a few which makes our choices to be made very carefully for our own ancestors.
In my own lineage you will see how these names are repeated:
Narvard, John, James, Samuel, William, Robert, John, William, Hugh, Robert
Remember in researching the middle name might indicate the maiden name of the mother.