Question on regnal names

Can they be hyphenated? Not referring to house name's but actual regnal names like say is a name like Maximilian-Philipp I HRE possible or does it have to be one or the other. The only example I can think of is Louis Philippe I of the French (not hyphenated but close) but I think that may have been more to distance himself from previous less fortunate Louis' of France. Thank you.
 
It is more common to see a singular regnal names but a hyphenated one is possible. Outside of the lists of regnal names of the Babylonians and the Assyrians, there are actually two that come to mind. Willem-Alexander, king of the Netherlands, and his daughter, Catharina-Amalia, princess of Orange.
 
No hyphen, but we also had King Juan Carlos I of Spain. But it seems to have been mainly a German thing to have two regnal names until recently- I suspect Popes John Paul I and II were an influence.
 
Are you talking about double regnal name or hyphenated double name ? For hyphens, maybe it is just an english language habit. In French, we use hyphenates names all the time, as in Louis-Philippe. This one wanted to be known as Philippe VII, but he was advised to use a new name, skipping the all continuity issue between the Kings of France and the King of the French. Double naming is quite common since the Middle Ages in certain cultures, namely germanic and occitan.
 
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