Stigler's (or somebody's) Law of Eponymy:

Give credit where credit is due, goes the expression, but in this week's words the credit is misplaced. Each of these words is coined after the wrong person.

It's not always easy to assign credit, however, as the contention on the naming of diseases shows.

There's even a law about misplaced credits. Stigler's law of eponymy says, "No scientific discovery is named after its original discoverer." Stigler credits this law to sociologist Robert K. Merton (thus making the law self-referential).

Thanks again, Pheas!   - and I'm taking the credit for this blog, even though you are doing a lot of the work!  LOL!