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Nana is a nn for a grandmother her, so that's off the list (English speaking countries, at least).
Mika- This is also a Polish name, I believe. There's a reporter here, Mika Brzezinski, whose parents are from Poland.
Jun- looks like misspelling of June, but useable.
Noa- looks like mispelling of Noah, but useable.
Miwa and Kiyona don't remind me of anything, so I can see people just saying "foreign name", so they're useable.