Thanks Bullitt I think you nailed it. I never thought about it in that respect. Leghorns are known for their egg production not their pretty roosters soWhy aren't they called "black-breasted red leghorns"?
I will take a stab at this question.
Well, the hens are not black-breasted or red. It seems that most chicken breeds are named for the hens, and that it is probably because more hens are kept to lay eggs.
There is also a Red Leghorn, but both hens and roosters are red in that breed.
If they named brown leghorns after the rooster, it would have to have a long name because of all the colors in their feathers.
all credit and identification go to the hens.
Makes since.