Palpatine's first name, if he even has one, has yet
to be revealed. That's not so unusual even in our own galaxy. For
example, in one of the world's most populous countries, Indonesia,
many people go by one name. And even some last names are just that,
not family names. In the Star Wars universe, we doubt that
there are many in the know for whom just plain "Palpatine"
isn't enough.