It wasn't confusing enough that Intel named their CPU core 'Core' or that they put 'Duo' after it if there wre two 'Core' cores packaged together, but they also put a '2' after it if it was the second generation, then they dropped the generation number from the name in the third generation, making that the first generation of their new numbering scheme of which you're discussing the second generation.

The only clear option is to use the internal code name, but that's technically not valid once it's released so "Products formerly Sandy Bridge" is the best Intel can come up with. (https://www.intel.com/content/www/us/en/ark/products/codenam...)