-ko names are considered dated in Japan, yes. out of the ones you listed, I most like
Kaya and
Aimi.
My favourite feminine Japanese names (no clue how they're perceived in Japan - if anyone knows, tell me!)
AkiraChizuruKaedeMidoriNaomiRinaSuzume
masculine list:
https://www.behindthename.com/pnl/191050/124079feminine list:
https://www.behindthename.com/pnl/191050/124080