[antjanus]

I'm Czech and under the dialect where I grew up, "Zluda" could be translated to "evil person/monster" or "mischievous person/monster".

Growing up, people sometimes called their kids "zludy" (plural of "zluda" in my language) -- or trouble-makers.

[hackyhacky]

Interesting. Possibly a variant of the standard word zrůda?

[antjanus]

Yeah, could be! I grew up close to the polish/slovak/czech border. I bet some of those words got mixed together.