[aorth]

It comes from жици in Bulgarian, which means "wires".

I think the author should remove that part of the blog post because it detracts from the author's point and is even a bit embarrassing that they hadn't looked it up.

A reference for the name: https://desktop.jitsi.org/Documentation/FAQ.html#spelling

[normie3000]

Thanks for the background. From the .si domain I'd assumed it was pronounced "Yitsi" not "Ðitsi".