MPD is Multiple Personality Disorder, when one is that fucking insane, or has that many issues, they divide themselves into different personalities, each of which has a name.
For example, from Piers Anthony
series, the Demoness Metria, who gained Demoness Mentia, or D.Mentia. (Anthony is noted for his ridiculous puns) and Woe Betide, after she acquired a soul.
October 05, 2004