This is obviously a decision for
Mike Campbell to make. Personally I think any name which has been the legal name of a real person would be appropriate to include on the site.
And just because the original poster thinks Malyssa is a "unique" spelling doesn't mean that it really is. It's actually a fairly logical respelling, and it's not hard to find other examples through Google:
http://www.facebook.com/malypoo
http://www.linkedin.com/pub/malyssa-lyles/b/908/93b
http://www.modelmayhem.com/1078586
http://www.linkedin.com/pub/malyssa-woodward/6/769/432
http://www.meetup.com/members/8921938/
etc. :)