ctenophora

I just got SL Premium to change my name, and looked up the name in game and nothing came up- maybe people can de list themselves so that's not a problem. When it said the name change was taken, i went to the account on the website, it took me to a page like it would have the name, but the name was different. (IE: james.wainwright > jack.wainwright) is this an error? or do people just keep every name they've ever had, and maybe this person changed their first name? is it possible to get a refund on premium if i only got it for this and i can't do it now? thanks in advance for any answers, and have a good day!