Of course "King Trump" goes against Western royal naming conventions. The practice is to use a regnal name (the monarch's first name or one of his/her middle names) rather than the family name. This is because with a monarchy passing from father to son every one of them would "King Trump" which would be boring. So instead it would "King Donald" or "King John", whichever he preferred to take at his coronation. I strongly suspect he'd prefer "King Donald" over "King John".
In the history of England there has been just one King John, and his reign has been viewed negatively for a millennia. King from 1199 to 1216, he is most remembered as the King who was forced to sign the Magna Carta (in English "Great Charter") that limited the power of English monarchs and established the principle that all men, including the King, are subject to the law and established some fundamental rights for "free men". At the time his reign started his kingdom included Normandy and other substantial parts of France. In his short reign he suffered a series of military defeats in France which cost him his French territory. Known as a particularly cruel king, he is the villianous King John of the Robin Hood stories. This history pretty much assured that no future King of England would choose John as his regnal name.
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