No matter how it's pronounced (which I have no clue after looking through all the ways), it's just bad! Especially in America where it will always be first pronounced as Jad-zee-ah I'm betting. What is so wrong with a "normal" name anymore?!
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Re: Jadzia
My first take is maybe it something Slavic? In which case Yad-suh or Ya-tsee-uh
But maybe just American made up in which case Jade-zee-uh
Oh!
It's Dax from Deep Space 9 - https://en.wikipedia.org/wiki/Jadzia_Dax
This was my first thought. Although it is pronounced differently than the polish Jadzia. I wonder which it is...
If it is Polish it's pronounced YAH-jah. Pretty, but I wouldn't want my child to be correcting everyone's pronunciation the rest of their life.