Two names are cumbersome.

[Aelthar]

Just My 2 cents.

I prefer a system when, in the character creation you have 2 separated input text. One for the name and one for the surname.

the FIRST name should be the one used as mandatory ID of your character, for uniqueness check, /tell parameter and stuff. Then you can, if you wish, input a surname and have it visible.

ALSO, and I know i will be BASHED hard for this .. but i'm a Roleplay whore, so it would be COOL for Roleplaying sake, have an option (so on/off switch) for showing only the names of people in your friend list, and other listed as Anonymous. But alas i know that such things are bound to be forgotten in the past, in some UO shard.. sigh