I love Japanese names :)
These work well in both English and Japanese :)
Marina (I have a Japanese friend names this)
Erika (I know several Japanese girls named this)
Naomi (was really common in Japan in the 70s)
Hina Rina NoaMika (
Mika,
Noa,
Rina and
Hina are all used in Japan and work well in England too)
Mia (I read that this was used many decades ago in Japan)
SaraAnna (
Sara and
Anna come from western influences but they are common in Japan now)
Sakura (I think this doesn't sound too foreign)