tl;dr:As a public service, I’m going to list assumptions your systems probably make about names. All of these assumptions are wrong. Try to make less of them next time you write a system which touches names. (1) People have exactly one canonical full name. (2) People have exactly one full name which they go by. (3) People have, at this point in time, exactly one canonical full name. (4) People have, at this point in time, one full name which they go by. (5) People have exactly N names, for any value of N.