With all the debate over whether the tenth planet is a planet, as well as what to name it, it's strange and improper that the Edgeworth-Kuiper belt is often referred to as the Kuiper belt.
Edgeworth published the idea long before Kuiper. In fact, according to John Davies' fascinating book Beyond Pluto, Kuiper may have stolen the idea from Edgeworth. Kuiper certainly did not cite Edgeworth's work.
Look what Edgeworth wrote in a 1943 article: "the outer region of the solar system, beyond the orbits of the planets, is occupied by a very large number of comparatively small bodies."
Edgeworth repeated his claim in 1949: "It would be unreasonable to suppose that the original rotating disk of scattered material came to an abrupt end outside the orbit of Neptune. There must have been a gradual thinning out of the material at the outer boundary....It is not unreasonable to suppose that this outer region is now occupied by a large number of comparatively small clusters, and that it is in fact a vast reservoir of potential comets. From time to time one of these clusters is displaced from its position, enters the inner regions of the solar system, and becomes a visible comet." His full article, in Monthly Notices of the Royal Astronomical Society, is here.
And when did Kuiper first publish the idea? 1951!
But Kuiper was famous and Edgeworth obscure. Consequently, many scientists give credit only to Kuiper. Of course, this just perpetuates the problem: Kuiper becomes yet more famous, Edgeworth yet more obscure.
The correct name for the belt of small bodies beyond Neptune's orbit is therefore the Edgeworth-Kuiper belt. And if it can ever be proved that Kuiper stole the idea from Edgeworth and deliberately failed to cite him, it really should just be the Edgeworth belt.
A similar problem occurred with the Hertzsprung-Russell diagram. Originally this was called the Russell diagram. Russell was famous, Hertzsprung obscure; but Hertzsprung had come up with the idea before Russell. In this case, there's no indication that Russell stole the idea from Hertzsprung. To be fair to Hertzsprung, the Russell diagram is now properly called the Hertzsprung-Russell diagram.