Why can't people give themselves names?

People's names are given by their parents, because parents give their children names from birth for convenience. This is an unchanging tradition. As we all know, when people come to this world, they must have a name, which is convenient for others to address. School and the like are essential. Imagine that we don't even know how to name ourselves. Wouldn't it be strange otherwise? So, if you want to give yourself a name, you can, but it can only be a false name. There is no way, so there is no reason.