Seriously though, if they weren't alternate IDs to hide from the police behind

, why did Tolkien give Aragorn so many names?
Aragorn
Estel
Thorongil
Telcontir
Elessar
Elfstone
Strider
Wingfoot
I know I'm missing one.
Plus his titles:
King of Gondor
Captain of the Rangers
the Renewer
Dunadan
Is this to emphasize his royalty and importance? Is there a parallel for this in any other story?