Reserve Your Character Name for Guild Wars 2

ArenaNet will be reserving all current Guild Wars names for the launch of GW2, and players attached to those names can then claim their reserved name in Guild Wars 2. You have to log into Guild Wars sometime in 2012, you have to claim your names in Guild Wars 2 by launch day, and you can't secure Guild Wars 2's single names (as Guild Wars forces you to make two-word names).

Source: http://www.arena.net/blog/reserving-your-character-name-for-guild-wars-2