What is the reference behind names "Alexander, Julian and Francis"?

What is the reference behind names "Alexander, Julian and Francis"? - White and Pink I Love You Letter Blocks

In Japanese science-fiction stop-motion movie "Junk Head", the protagonist meets three individuals named "Alexander, Julian and Francis".

It is surprising because all other characters do not have such traditional occidental names ("Hokuro", "Ponta", ...).

Are those three names a reference to some specific story, or an homage to some individuals?






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Battle of Strasbourg, 357 AD ⚔️ Julian saves the Western Roman Empire




Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: DS stories, DS stories, DS stories, Brett Jordan