I had several Japanese roommates when I lived in Australia and still have many Japanese friends. I squeezed them out about Japanese baby names because I was so interested in them :) They were all born between the early 80s and early 90s.
From what I observed:
Akane seems to be really common, I know three, all born in the early 90s.
Ayano must have been quite common in the 80s, I know one and she told me it was used quite a bit in the mid 80s. I also know a
Rina, born in the early 80s, but she was the only one I met.
Sakura must have been common in the early 2000s, my friend said it was used a lot during that time. Also it's the middle name of the daughter of a friend whose husband is Japanese (
Chloe Sakura).
Momoko must have been extremely common because I know many, most went by Momo. Same with
Miho and
Mio. I never met a
Miyu but several girls named Miyuki who went by
Miyu. I also met lots of girls named Kanako who went by Kana, but never a girl who was just named Kana. I know a Chihiro and an
Aiko, but no girl named just
Ai. From what I heard
Aiko was common after the little princess was born. Maybe Chihiro got some attention through "Spirited Away", it's one of my favorite Japanese names. I'm pretty sure
Daisuke is common as I have met a few and
Ryo (I don't remember the spelling, could have been
Ryuu) was quite common as well, but the pronunciation sounds very different from what you'd expect, I liked it a lot until I heard it pronounced.
My guess from what must have been really common in the 80s:
Akiko - I know so many girls named this, some go by
AkiSachi and
SachieMidoriMomokoMiyuki
AyanoMioMihoMikiKanako
Chiho
Yoko and
Youko (maybe more late 70s, early 80s)
HidekiHiroyuki (extremely common, met lots of guys who went by Hiro)
Satoshi
Hironori
Ryo
And in the 90s:
Hiromi
Kazumi
SakuraAkaneAiko
Daisuke
I also met a
Marina and an
Erika, they sound very familiar but are also Japanese names. I always found that interesting.
Hope this helps a bit