Because it was first by hatmakers Thomas and William Bowler.

Hi Vultan - please do not rate this answer - it is to xoloriib's question about Why there are atheists - he has blacklisted me so I can't answer it - anyway - there are atheists because some people think proof of something is handy before expressing any belief - there is no proof of any god whatsoever - I find it incomprehensible that anyone can believe in a god - I think it is merely a sign of weakness and insecurity - primitive man had good reason for such fears when death was never far away - but not now - it is a nonsense.

it originally was called a coker after the inventor, but like vacuum cleaners it became known by the name of the main manufacturer