Yes. Or so says this site. Which, I guess, might just be trying to drum up business among the Jews. Anyway, here’s the relevant piece of the text:

The Wild Things (except “Goat Boy”, of course) were named after (and are presumably caricatures of) Maurice’s aunts and uncles: Aaron, Bernard, Emil, Moishe and Tzippy.

Careful, people, there really is an international conspiracy. And it’s roaring its terrible roar, gnashing its terrible teeth, and rolling its terrible eyes.

(Also, if you’re interested, there’s this.)