There is many different ways, but there is only ONE pretty way. and that is Hillary
Spellings I've unfortantely seen are :
I only like the traditional way as it is such a lovely name would not want to change it
The only one I would use is Hillary
I'd seriously only use Hilary, though.
Just wanted to point out that it is both a girl and a boy's name.
I looked at some of the spellings and think the traditional way is the best.
Hillary for a girl and Hilary for a boy. So my answer is two (2). *:)