I'm having a hard time telling apart users whose "names" are a series of numbers. The avatars don't help much either, if you have three users whose "names" are @numbers answering one question or making comments and their avatars look alike, it's even more confusing.
Moreover, I avoid mentioning their "names" at all because I feel as if I'm a character from The Prisoner: "Yes, user37562 that is correct, but he or she (or it) has forgotten..."
Does ELU or the moderators for ELU advise registered users to change their monikers (handle) at any given time? If not, is it good etiquette for one user to another to suggest they do? I found this answer on meta but it doesn't fully address the issue: User name-changes and effect on comment clarity.