And if for some reason you managed to do it, you would be called Mr. MiddleName in all communications.
As a curiosity, Spanish people often have the opposite problem - for example, in academia, if we sign papers in the "natural" way (FirstName FirstSurname SecondSurname) we'll be indexed as Name F. SecondSurname, which is quite jarring for us because we typically go by the first surname, not the second. So many (probably most) of us hyphenate (FirstName FirstSurname-SecondSurname) to avoid automated systems (or humans from other countries) to extract our surnames wrong.
And then some people have First-Name firstnames where either part is also a name, but whole thing is one Firstname... So calling someone with just First is often wrong...