Xi- commonly makes the "she" sound
I don't understand how "shee-own" sounds so weird to you guys...
Because it doesn't generally make a "she" sound when it comes to the organization members.
Roxas, Axel, Larxene, Demyx, Vexen, Zexion, Luxord, Saix, and Lexaeus all have cks sounds.
Xemnas, Xigbar, and Xaldin have Z sounds.
Only Marluxia and Xion have "she" sounds. And until Days came out, only Marluxia had that sound in his name. So I can understand very well why it sounded wierd to everyone who was used to the way it sounds in the majority of the org members' names.