Zeth - hm, weird for here (Canada) is it common in Sweden?
No, it's very rare. According to the statistics site (SCB), there are 2 313 Seth and 774 Set (an alternative spelling) in Sweden, but only 161 Zeth. So the name is rare all in all. Z is only found in borrowed words in Swedish (like zebra, zoo...) and since we don't have the Z sound, we pronounce it like S. Which is why some people fancy spellings with a Z instead of an S, like Zeth, Zara, Alizia, etc.
Ossian - like Ocean? Probably not, but that's what I'm hearing
Pretty rare in Sweden. Pronounced OO-see-un (app.)
Juni - is it YOO-ni or JOO-ni?
More YEW-ni, actually.
Does the sea exist
Because of our longing?
My PNL
http://www.behindthename.com/pnl/3258/61573