Yes, Michaela may be the traditional spelling but as all of you pretentious folks may realize, language never remains a constant. It's natural for language to evolve/devolve. However, for those who state the name isn't trendy as though you're stating a fact, you confound me. For the past decade and a half the name has come out of nowhere (not actually but you must admit it's obviously much more popular) so I think to deny its trendiness is a tad delusional.