I really love Hazel. It gives me the same feeling as Esther, Ramona, Olive, and Frances do.
I don't see it as becoming horrible trendy. Definitely not top 20 for at least the next five years.
Hazel Augusta is superb. Sandrine seems like a third wheel next to it. It's not that it's too long, it's just that Hazel Augusta is simply wonderful that Sandrine drags it down. Sandrine is sophisticated, but the combo is not the place for it.
Hazel Augusta is perfection as far as I'm concerned, but just for fun, how about:
Hazel Frances
Hazel June
Hazel Naomi
Hazel Anne
Hazel Victoria
Hazel Justine
Hazel Camilla
Hazel Audrey
Hazel Ramona
Hazel Theodora
Hazel Diana
Hazel Clementine
Hazel Jeanette
Hazel Susanna
Hazel Beatrice
Hazel Hermione
Hazel Georgina