How to get player Character name?

[zgrssd]

For my CCDR I logically have use the character names to order my data (so I can have Character specific data in my account data).
I have seen other addons do that (most craft and reseach addons need too since they correlate data from multiple sources).
Yet I cannot find any "GetPlayer Name" or similar function or any global constant the would logically contain the name. So how do I get a Characters name/some other unique ID to indentify them by?