The word vengeance is said in Japanese as fukushu. This word is said in Italian as vendetta and in Latin as vindicta.
If you're talking about Birth By Sleep, then the answer to your question is yes. It will explore the Keyblade's and Xehanort's origins. Vensus is Latin for air and Sora is Japanese for sky. Terra is Latin for earth and Riku is Japanese for land. Aqua is Latin for water and the Kai in Kairi is Japanese for sea. Ven and Roxas resemble each other greatly. It might also show the first six apprentices of Ansem the Wise.
If you mean 'nana' to be the Japanese word for seven, then you want 'septum'.
Xehanort
They aren't.
"Jezu" is not a Japanese word, but it could be an attempted way of maintaining the Latin pronunciation of "Jesus."
To write the word garnet in Japanese you write ganetto. To say this word in Latin you say carbunculus and in Spanish you say granate.
To say the word vampires in Japanese you say Kyuketsuki. This word is said in Italian as vampiro and in Latin as lamia.
Latin is like Japanese in that there is no word for the, nor any use for it. EDIT: While this is true in Classical Latin, common Latin (or vulgar Latin) did have a word for "the": ille, illa, illud (that/those). These words are the roots for and the reason that le, la, il, and the like are "the" in French, Spanish, and Italian.
The word anime is an abbreviated pronunciation in Japanese of "animation"
SPOILERSAnsem is a scientist who's later known as DiZ. The real Ansem never became a Heartless. Xehanort is Ansem's apprentice and first experiment. Xehanort later named himself Ansem when Xehanort became a Heartless.Xemnas is Ansem's Nobody.So there are two Ansem's (the imposter Xehanort and the real one named DiZ).DiZ uses Darkness, while Xemnas uses Nothingness.Ansem (Xehanort) and Xemnas are two halves of Xehanort.
There is no latin word for the word volcano. Volcano was derived from the name of the Roman god, Vulcanus.