What are the real names of the members of Organisation XIII? In Kingdom Hearts 358/2 Days we see how Roxas is actually an anagram of Sora with an X in it and Axel's original names is Lea, as mentioned by Saix. I also remember reading somewhere that Xemnas's name is anagram of Ansam.

So I am wondering, what are the original names for all the Organisation XIII members?
I. Xemnas = Ansem Xehanort
II. Xigbar = Braig (Bleig, in the NA version of KH2)
III. Xaldin = Dilan (Dilin; Ibid)
IV. Vexen = Even
V. Lexaeus = Aeleus (Eleus; Ibid)
VI. Zexion = Ienzo
VII. Saïx = Isa
VIII. Axel = Lea
IX. Demyx = ??? 
X. Luxord = ???
XI. Marluxia = Lauriam
XII. Larxene = Elrena
XIII. Roxas = Sora



   XIV. Xion = "nobody," Sora's (imperfect) replica with Kairi's memories. 
 From the Tomoko Tanemaki, one of the scenario writers and writer of the KH novel: Xion's name contains the Japanese words for "tide" (潮, shio), fitting the oceanic naming theme of Kairi, Naminé, and Aster tataricus (紫苑, shion), which according to Japanese floriography, means "I won't forget you" or "remembrance."