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Great question, Jade. I have always pronounced it jar-DEEN, with a hard “J” sound and emphasis on the second syllable.
My friends on “Zucchini Warriors: A Gordon Korman Podcast” use a soft “J” and either initial emphasis or equal emphasis to make the name sound like ZHAR-deen or ZHAR-DEEN. They are from Canada where French-derived names are more common and (I suspect) typically less anglicized.
Of course, we both know one person who could clear up what pronunciation HE had in mind while writing A SEMESTER IN THE LIFE OF A GARBAGE BAG.