Just kidding. It's named after no one. It comes from the word "vanquish." So naturally, from here on out, I will only be spelling it vanquomycin to be more correct.
It was actually originally called Mississippi Mud because (I kid you not) the preparation was brown and full of impurities. I guess if I had to choose, I'd rather my antibiotics be named after a word meaning to conquer than after murky river dirt.
|But I mean... yumm: Mississippi Mud Cake.|
..I'm not lying! Source