it should be Ian, thats actually a good name Ian Palpatine
yes!
but in seriousness there are 2 names that are common among SW fans.
1) is Cos Palpatine, this comes from the original version of palpatines character in Lucas's early scripts, he was named "Cos Dashit" and many Star Wars fan fiction writers have quite incorrectly adopted the name "Cos Palpatine" in their stories and web pages, so much so that it has become fanon.
2) is Dauntis Palpatine (which i like better) is from Supershadow. and this because of SS's 'popularity' has become accepted as well.
but none of this is official in any sense.