@KatS We, at one point, picked up a cultural idea that all things in this world have some discernible "purpose" intrinsic to them and go outside of it is to "violate its nature", and it gets projected onto all wild manner of things, including something as simple as changing your name.
At a legal level, some amount of friction makes sense; changing your identity can be a tool to evade a contract or debt. But there's even a cultural "how dare you be so vain" attached to changing one's name.