Different ways to spell Ian.

I know there's a lot of people out there who have negative things to say about changing the spelling of names but whatever it's what I like so all of my kids will have weird spelled names or different spelled names. My daughter's name will be Shaniya-Lynn Instead of Shania. My son's will be names Xaviyer instead of Xavier. But I've recently gave fallen in love with the name Ian. But I want it to have a Y in it because that's my favorite letter. I was thinking Iyan,or Yan. Which would be better?!