Years ago my older sister and I were sitting in the local Registry office and we could hear someone registering a new baby - and we overheard some of the conversation - "What is the child's first name?" "Buster!" "No, what is the child's real first name?" "Buster!" "Why don't you keep calling him Buster as your nickname for him, and give him a different first name?" - unfortunately we were called into a different office at that point, and never heard how it ended - so if there is a person called Buster (I presume a man?) born in 1984, I hope your parent was talked around to a sensible name by the registrar!
My father was very keen to call me Harriet, but fortunately that did not happen - I honestly didn't twig until my mother and I talked about it in the last few years, my father was Harry! I got lumbered with a not particularly nice name that I have to spell to most people and I always have to spell my surname to everyone. In my year at school there were 5 Susans, 4 Louises, several Elizabeths and Gillians and at least 4 Sarahs. Not an Isobel, Sophie or Emily in sight.