I really love Japanese names, especially the meanings. Admittedly it would be a little unusual for a child that's not Japanese to have a Japanese name, but some you could probably pull off. I'm thinking of
Aimi,
Hana,
Ren,
Rin,
Naomi, even
Airi maybe.
Of the ones you picked,
Izumi,
Hoshiko,
Natsuki,
Ayame, and
Sakura are lovely.
My other favorites:
AiKyoko
AkiraArisa
KokoroChinatsuHikariMitsuko