Unfortunately "monad" gets used in a few contexts unrelated to the sense the OP is asking about. Similarly, the (cancelled) TV series Caprica recently started using "monad" to mean "monotheist".
On the other hand, it seems that if one is willing to propose a similarity between one of the cornerstones of rationalism and the misuse of "monad" by a fictional character on a canceled television series, one might be more open to seeing more direct lines of intellectual descent from an inventor of the calculus to functional programming.
The embedded type system of a programmatic monad remains unchanged despite the monad's combination into higher level structures - a somewhat Leibnizian characteristic.
