First, all names cannot be on this site. There are an infinite amount of names, its impossible.
Second, Aideen looks like a kreativ Irish name, and not one I've ever seen or heard.
Third - the moderator can't tell you why a name is or isn't in the database. She's not the creator of the site, and she's not in charge of the database. Mike C. is. (And Mike C. won't add an name unless he has definitve proof that its a name, its history usage, and something of its etymology.