“The source of this rumor is stormfront dot org May 5, 2016. It is based on Zelnick being a Jewish name which IMHO does not even qualify it as a rumor because Zelnick is not a uniquely Jewish name.”
Ok, so Ivana is Jewish because maybe her father has a Jewish name? By that logic, her mother is also Jewish because after she got married she also had a last name that might be Jewish? You would think the rumor mongers would do better than this. Unless Marie Francova is Jewish, as TrueBT states, then the whole theory is debunked.
A quick web search reveals that her two brothers did not marry Jewish women- Vanessa Hayden, Donald Jr’s wife is not Jewish, although her father was (family was originally called Hochberg). And the rumors about Lara Yunaska, Eric’s wife, being Jewish seem just as tenuous- they are based on the fact that Jared officiated at their wedding, which made the press jump to the conclusion that it was Jewish wedding and that she is Jewish, which she denies.
Besides, would a beis din go thru the farce of pretending to do a geirus (and a controversial one, at that) and risk its reputation and make a mockery of all geirus as a result? Supposedly just because Ivana doesn’t want anyone to know she is Jewish?