In Lord of the Flies, what is Ralph's last name?

In The Lord of the Flies by William Golding, we have details about only a few of the boys' lives before the island—and last names are rarely provided. We do not know Ralph's last name; the only main character whose last name we learn is Jack's (Merridew). Especially considering that Ralph is established as the main character from early on, it is somewhat surprising that his antagonist would be given a full name while Ralph is not. Perhaps the main reason for this choice is to further emphasize the distinction between the two boys. In the novel evil has a name, and once named the darkness that Jack experiences can more easily permeate through the entire group of boys. Conversely, Ralph is one of the few who does not fall completely in darkness, perhaps meaning Golding is holding on to the idea that the "unnamed" character can represent any man, meaning that anyone has the potential to resist the darkness.