He was a rich nobleman that tried to pass some discoveries of one of the Bernoulli brothers as his own, in exchange for cold, hard cash. He was partially successful. Despite this fact becoming broadly known in the math world, a important rule in calculus is still known by his name. See https://en.m.wikipedia.org/wiki/L%27H%C3%B4pital%27s_rule and https://people.math.harvard.edu/~knill/teaching/math1a_2011/...

I guess the name stuck because naming even more things after the Bernoullis would just be too confusing.

“List of things named after members of the Bernoulli family”: https://en.m.wikipedia.org/wiki/List_of_things_named_after_m...

Thanks for the history lesson. Yes, I know the rule from high school. Newton however did a much better job in making his name live forever. And they all succeeded in erasing their questionable behavior from lectures. Money can buy a lot.