Which one is correct to indicate that the real name and what it is called by people are different?
That place is Chehel Sotoun Pavilion but it's famous ( to / as / of ) Kolah Farangi Pavilion.

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"better known as"

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Well, if Chehel Sotoun Pavilion is the real name, but people usually refer to it as Kolah Farangi Pavilion, then you could write it like this:

''That place is called Chehel Sotoun Pavilion but it's known as Kolah Farangi Pavilion.''

I believe it sounds better this way!

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The real name is Chehel Sotoun Pavilion.  I wanna know if it is possible to use the word "famous" somehow or not?

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can you tell me which one is the real one