The story goes that first sans serif types were based on didone proportions. So I am guessing that a sans serif didone would be one of those.

This is because the classification doesn’t consider this element. A sans with high contrast between thin and thick could be a geometric, like my Noir. Or it could be a humanist like Optima. Or a grotesque, like Giorgio. *

Even in a serif, the contrast isn’t really that big a part of the classification. It’s more about the shift in skeletal form and writing tool, and this again plays out in the rythm and contrast and the details.

* Of course, very few faces are spot on. Many geometric designs incorporate grotesque or humanist traits, for example.

Sang Bleu is the closest I can think of:

Contrast is just one characteristic of a typeface. Didones have high contrast, but by most definitions they also have a specific type of unbracketed serif. So, too, would a sans with high contrast have other traits. It could be "high contrast humanist sans" or "high contrast Grotesque". They are also sometimes called "stressed sans".

Thanks for the comments. Although "Stressed Sans" and "high contrast Grotesque" are correct, they aren't very marketable as font names. ala XYZFont Stressed Sans, etc.

But they didn’t need to call it Helvetica Grotesque either, did they?

I didn't know you were seeking a name for your typeface. Frode's right. Don't force it.