I've heard this pronounced in English as both ZEE-nee-ə (ZEE-nyə) and ZEN-ee-ə (ZEN-yə). The first pronunciation is clearly influenced by Xena, whereas the latter pronunciation is likely influenced by the Slavic variant Kseniya.
― Anonymous User 4/16/2021
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In Greek, pronunced "kse-NEE-ah" and the English pronunciation is "ZEEN-ee-ə".