USA is not a really creative name but at least a unique name, not confusing, and it doesn't sound too bad. This way you can be glad with this name. In contrast to this the name for Germany is somekind weird as depending on where you live the name for germany comes from many different basis. The french call it L'Allemagne, Germany is the english name, and Deutschland (i'm glad that the older version "Teutschland" became extinct Oo) is the german name. I mean compare it with other countrys: L'Italie, Italy and Italien, or L'Espagne, Spain and Spanien, when you know the name in one language you somehow now know it in many languages.
The only thing i really don't like about the name USA is that many people tend to short it with "America", which somehow reduces the whole double-continent to being representet by one single country.