[jack-r-abbit]

K-cup® is their official name. I've never heard anyone use "Keurig cup" before. Is that a thing where you are?

[lepht]

I worked at Green Mountain Coffee Roasters (the owners of Keurig) around the time they were first gaining traction, and remember them briefly being called "Keurig cups" internally before the "K-cup" shorthand caught on.