I actually assumed, well into my teenage years, that people's middle names were their mother's maiden name, as that's the case for me, my sister, and my cousins.
Another interesting one I would see a lot is <mother's father's name> <father's father's name> <last name>.
For example, My dad was Charles Marvin Gore.
His mother's father was Charles Maltbie.
His father's father was Marvin Gore.
I don't think I ever saw the two modes combined though, so no example of a Charles Marvin Maltbie Gore. Although that is just in my family. It might have happened in others.
For example, My dad was Charles Marvin Gore. His mother's father was Charles Maltbie. His father's father was Marvin Gore.
I don't think I ever saw the two modes combined though, so no example of a Charles Marvin Maltbie Gore. Although that is just in my family. It might have happened in others.