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It sounds like you are still trying to create a pivot table with Persian dates and month names on an English system!?
As a reminder, I'm still waiting for you data and a sign that you uploaded them:
https://answers.microsoft.com/en-us/msoffice/forum/all/how-to-create-a-persian-calendar-and-pivot-table/540ffc94-4f87-4b59-beed-66fde3ee069c
The short answer to your questions is: There is no direct translation, but most date functions in M support a "culture" argument which is the language tag => "fa-IR": https://learn.microsoft.com/en-us/powerquery-m/date-monthname
But the dates of a Persian calendar are not synchronous with the Gregorian calendar:
I am not an expert on the Persian calendar, I know many calendars and each has its own peculiarities.
If I say something wrong about the Persian calendar, please correct me.
BTW, AFAIK there are also other month names in the region of Indo-Iranian, but it's not so easy to get them:
Any further questions?
Andreas.