I kinda don't want to use a very generic name, even if the spelling is different. Also, I found out someone else has a Sylveon OC with the same name here, and a similar colour scheme. So I decided I'd think up a new name.
Since my Fursona is named Azuretare, I looked up what shade of blue my Sylveon sona is, and apparently the really light blue is called Celeste. I then brainstormed ideas for a name from the colour, and came up with Celestin, Celestion, and then I thought up Celesteon. (Sel-lest-ste-on) It's a good name because all the Eeeveelutions have "eon" at the end of their name, and eon fits pretty well with the rest of the name. Also, it's similar to "Celestial", which is defined as:

"Positioned in or relating to the sky, or outer space as observed in astronomy."

And Celesteon has a star on his left paw, so I thought that would fit pretty well.