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Yes. The "o" in Jona would be shorter than "oo" in Joona.

Gah, yes, I suppose. :)

You see, we call ё "joo" in Finnish.

I would say Ёна the same way as Joona, but I suppose that could be different for a native Russian speaker.

I was, however, trying...

I hate trying to write Finnish phonetically in English, so I hope cyrillics are ok:

Ёна Пухакка (yes, it's that easy)

Stress is on the first syllable.