Kingdom Hearts II Nobody question

I love the Heartless/Nobody ideology! I find it so fascinating.
But basically it works like this:

Every person (and we can assume world/animal too) is made up of three parts: A Heart, A Body and A Soul.
When someone either loses their heart to darkness, or casts off their heart willingly, their body gets split into two separate entities. The heart gets consumed with darkness and becomes a Heartless. While the body and soul become a Nobody.
If a person with a strong heart loses/casts off their heart, the Nobody created is of human form. (ie. Sora->Roxas. Xehanort->Xemnas)
Naminé is an extremely special kind of Nobody, in that the way she was created is like no other.
She was created when Sora unlocked his and Kairi's heart with the Heart Unlocker in Hallow Bastion. She is different from most Nobodies. She was made from Sora's body and soul yet is still technically Kairi's Nobody. This connection with Sora is why she has the ability to alter the memories of Sora and those connected with him.
DiZ refers to her as the most fleetest of shadows.

Anyways, i hope that answered your question, i kind of didn't finish explaining it all but that is the jist. :D

EDIT: Oh and only members of the Organization have their name rearranged with an added x.
How Naminé got her name is unknown.