a woman in the bible was named
Noah. There was of course also a man named
Noah in the bible. So it's usable for both genders.
If definitely hasn't been brought on by
Miley Cyrus' sister. It has always been used as a girls name as well as a boys name. For girls it's often spelled
Noa, but whether you spell it
Noa or
Noah is completely irrelevant as you translate it from Hebrew and a name is usually translated by the way it sounds.
Noa and
Noah sound the same.
Noa is the number 1 girls name in
Israel, by the way and used in several other countries. Personally I love
Noah and
Noa for girls.