I've always heard them called DuPont connectors. Might be a hobbyist vs. professional thing; I use them in hobby projects, so am probably exposed to the questionable vendors more than a professional would be. I was looking for crimping tools relatively recently and was surprised to find that reputable vendors don't call them DuPont connectors, even in passing. As far as I can tell, they have no name that everyone would recognize and that lets manufacturers steer clear of naming other companies, despite being so ubiquitous.

(I suppose this is a common problem with connectors. Someone could tell me "it's a Molex connector", and I'd know what they mean -- the one that supplies power to pre-SATA hard drives -- but of course Molex makes thousands of different connectors, so it's really a terrible name for that one specifically.)