With all that has been said about "calling it the right thing", I can't say the last time I asked my local supply house (with 30 locations across 6 states) for 8P8C and actually got anything more than "What?". Don't feel bad because I have to use the genericized names for tools or material. When's the last time someone asked for 12/2 non-metallic sheathed electrical cable? Most of us know it as Romex regardless of the brand.
I suspect that you are talking about Graybar who nowadays caters to sparkies. So I hardly think what they have to say is authoritive for this industry.
And by the way, I always ask for NM at my supply house (not Graybar) just to keep them on their toes.
-Hal
