Theorems' names that don't credit the right people The point of this question is to compile a list of theorems that don't give credit to right people in the sense that the name(s) of the mathematician(s) who first proved the theorem doesn't (do not) appear in the theorem name. 
For instance the Cantor Schröder Bernstein theorem was first proved by Dedekind.
I'd also like to include situations in which someone conjectured something, didn't prove it, then someone else conjectured the same thing later, also without proving it, and was credited with having first conjectured it.
Similar unfair things which I didn't remember to include might also be considered.
Some kind of reference is appreciated.

Wilhelm Killing:
To quote Wikipedia:
"
From 1888 to 1890, Killing essentially classified the complex finite dimensional simple Lie algebras, as a requisite step of classifying Lie groups, inventing the notions of a Cartan subalgebra and the Cartan matrix
"
Also Coleman in the greatest mathematical paper of all time says
"By one of those miscarriages of justice which are commonplace in mathematics, most of the fundamental results about Lie algebras which were discovered by Killing are usually attributed to E.Cartan."
and
"
He (Wilhelm Killing) exhibited the characteristic equation of the Weyl group when Weyl was 3 years old and listed the orders of the Coxeter transformation 19 years before Coxeter was born."
Also Killing was the one who introduced the notion of the 'characteristic polynomial' (see this).
