I’m against it because it doesnt make people uncomfortable because of the subject matter, but because it’s flippant. “Zombie Slave” would in my mind be a lot better than “Zlave”. Zlave is a humorous play on words - hardly something meant to have negative connotations. The subject matter does, but that’s the problem - it’s a casual and flippant approach to something bad.
There’s no bite to in regards to the content it names, just questions about “who thought it would be a good idea to name it something like this?”
It’s not about making it “nice”, it’s about not trivializing it and sugarcoating it and making it seem less bad, which is exactly what the term zlave does (while still connoting bad things, I think the reaction people are having is because it simultaneously makes them sound not so bad)
I’d much prefer Zombie Slave to Zlave for that reason, although none of my recommendations for names have been intended to “sugar coat” and I still think they are better. Zombie Friend and my other suggestions along that direction were because disconnect=>horror. Giving something a nondescript and intentionally bland and inoffensive name that is clearly not an accurate descriptor is an intentional rhetorical device used to accentuate the horror. It’s subtle, but good horror tends to be, and you need a disconnect between outward appearances and what is true for that to work.
Pack Zombie was because it was a more accurate description - despite what you’ve said, the zombie you do this to isn’t anything like a slave. You can’t give it orders or commands, you can’t set it to tasks. It simply does what it does, and you make use of that. The use you make of it is… using it to carry you stuff. In order to actually get a zombie slave (and actually, this is an inaccuracy in the term Thrall too), you’d actually need some sort of device that would allow you to control it instead of just limit it and then make use of its natural tendencies. The zombies under the effect of the pheromone are MUCH closer to slaves than the creature you’re creating here, since even if you can’t command them they act on your behalf. Bound Zombie, Crippled Zombie, those would also work as descriptive but more accurate names.
I think Thrall just sounds better, and has the connotation of being physically bound, which works well here for descriptive purposes.
Again, my primary opinion here is that Zlave is really, really weak, especially if you want to go for the sort of thing you’ve described in this thread in terms of the purpose of the name. Zombear? That’s fine, it’s a joke. The discomfort people are experiencing here, I would guess, has a lot less to do with it being a slave, but with the idea of it being a slave being made into a dumb joke.
And it doesn’t seem like you want “dumb joke” to be the takeaway of this process on the players end either, so honestly, better name would be better.