Actually, I've written Shaoran all my life, and I know tons of latins who also do that. But since a lot of people are used to Syaoran, I force myself to write it like that, since they wouldn't know who am I talking about.

But my favorite spelling (the one on CCS and TRC Spanish mangas as well) is the Chinese: Xiao Lang XD

I'm proud to say I've been geek enough to actually check his kanji names in a Chinese/Spanish dictionary. Indeed, the pronunciation is Li Shiao Lang, and the meaning is Plum Little Wolf. But I digress.