It seems quite unlikely that there will be so many users that are all named "Y"! (Sorry, I do, of course, know what you really mean, and I've been trying to resist making this comment the whole day but I finally gave in to the temptation.)

@gupe agreed, it would be hard to name ALL users "y". Discord could have maybe worked with their discriminator number thingamajig, but they got rid of that. Oh well!