The word philosophy was probably coined by Pythagoras.  
his theorem is very good
Pythagoras's theorum has more to do with math than philosophy.  
true, but everything is related
Yes,. Pythagoreanism is highly invluential in both mathmatics and philosophy. 
any other subjects he is known for?
His political teachings were popular in ancient Greece, but not so much today.  
There are no longer people that can excel in many fields.