It does seems a bit silly. I thought they made sound cards too but probably that's Wolfson ;)
So I merged the tags and left a synonym wolfram -> mathematica behind. However, it seems that Mathematica makes more sense as a subcategory of Wolfram-engine than vice versa, so I then created wolfram-engine and mapped mathematica to that, with the blurb:
Wolfram-engine implements the Wolfram language and powers applications such as Mathematica. Use this tag for questions about any of the above.
Which is a bit flippant, but I qualified that in the wiki:
Note that Mathematica has it's own Stack Exchange site, and questions about general use belong there. This tag is expressly for issues with installation of Wolfram products on the Raspberry Pi, and other questions unique to the platform.
Thanks again for taking the time to point things like this out.