Easily understood? Looking at that link, the term has been used by many different philosophers with many different meanings. Leibniz's monads are the most famous, and they have nothing in common with category theory monads except the name.[0]
The mathematical concept was in use for years before anybody decided to call it a "monad" anyway. According to Wikipedia: "The notion of monad was invented by Roger Godement in 1958 under the name 'standard construction'. Monad has been called 'dual standard construction', 'triple', 'monoid' and 'triad'. The term 'monad' is used at latest 1967, by Jean Bénabou."[1]
The mathematical concept was in use for years before anybody decided to call it a "monad" anyway. According to Wikipedia: "The notion of monad was invented by Roger Godement in 1958 under the name 'standard construction'. Monad has been called 'dual standard construction', 'triple', 'monoid' and 'triad'. The term 'monad' is used at latest 1967, by Jean Bénabou."[1]
[0] https://en.wikipedia.org/wiki/Monadology#Summary
[1] https://en.wikipedia.org/wiki/Monad_(category_theory)#Termin...