But why were these positions named after his way. is it because of certain people that played these positions
Just a guess, but it is probably just to reduce the words used for each position down to one syllable for dicussion and practice.
Weak, strong, and middle are words that can be used for other calls. So, if you need to call a middle stunt, the linebacker doesnt hear middle and get confused. If you call a middle stunt, mike fire, then the mike linebacker knows you are talking about him.
I believe so, for the 4-3 at least.. with 4 LB's i believe its sam, luke (left inside), rick (right inside), and will.