My father and several of his brothers all used their middle names. I asked my grandfather once why that was, using my uncle Paul as an example.
"Well," he said, "we wanted to call him Paul, so we named him John Paul."
"Why didn't you name him Paul John?" I asked.
You would have to know my grandfather to understand that to this day I do not know if he was serious or not when he answered, "We never thought of that!"