Blizzard has announced that World of Warcraft accounts that have not been used since December 7, 2010 will have their names entered back into the pool of available character names. The 6.2 patch is scheduled to be released on Tuesday, June 23, 2015.
If you're interested in keeping your character names, you will need to log into your account before the patch goes live on Tuesday.
Read the full post on the World of Warcraft community site.