His Holiness, The Pope wrote:
Maybe because there were other Husseins who weren't as nasty, like the king of Jordan. You know, to avoid confusing him with a dead man.
this is the exact reason. calling saddam hussein 'saddam' became popular during the first gulf war in order to differentiate him from king hussein of jordan. not to mention that names are ordered differently in arab countries than in european ones, and father/son and family/village relationships are easily identifiable by one's name. for example, saddam's full name is saddam hussein abd al-majid al-tikrit (saddam hussein, servant of the glorious tikriti clan) and the current king of jordan's full name is king abdullah II ibn al-hussein (abdullah II, son of hussein). the former king of jordan was king hussein bin talal (hussein, son of talal). so, in fact, they are all 'mr. hussein' in one way or another.
by the way: hussein is the diminutive of hasan, which means handsome. it's a very popular name in the arab world as it's the name of one of muhammad's grandsons.