Rachel, seeing as it's my name. It's the most common spelling and people still seem to have trouble with it. (I've gotten
Rachael, Rachal,
Racheal,
Rachele, and once, I think my school managed to get my surname stuck in my first name and I got Ratzel).
Raquel and usually
Rachelle are pronounce differently. I wouldn't even consider
Raquel the same name.