What do you think Emperor Palpatine's name is?

My partner and I realized the other day that none of the movies or books of Star Wars ever say what the Emperor’s first name is, if he even has one. This is apparently a big thing, an unsolved bit of lore. On the planet he’s supposed to be from people have two names. What do you think his name is, or at least should be?

Apparently a common joke is that his name is Frank, because somewhere in the prequels he says “I must be frank.”