In the French Language what does Eiffel mean?

"Eiffel" in French doesn't have a direct meaning in the way that a word like "bonjour" does.

It's a surname, specifically referring to Gustave Eiffel, the engineer who designed and built the iconic Eiffel Tower.

So, while "Eiffel" doesn't translate to anything specific, it's strongly associated with the tower and its designer.