It looks to me that
Xenia would be the female form of
Xenon.
I had an old relative named
Xenia, it was pronounced as "Senya".
Polyxena looks like a noun b/c of the "poly". Polyester, polyglot, polygamy etc.
I like
Xenon better than
Polyxena, but I like
Zenon better (a different name of course).
"You sought a flower and found a fruit. You sought a spring and found a sea. You sought a woman and found a soul. You are disappointed."
"It does not become me to make myself smaller than I am." (
Edith Södergran 1891-1923)