In Germany, it is intended to be hard to change your name; in the USA, the situation is different. Also in Germany, if you change your name voluntarily (without having a very good reason (CLARIFICATION: of course marriage is a good reason)), this is considered to be a strong sign that you deeply hate your parents (and did the name change because of that). Indeed, the people who I know who changed their first name to their middle name exactly did it because if this.