Wikipedia Language settings will return the same results if either of keywords 'Farsi' or 'Persian' is entered.
'Search [language] wikipedia' and the article language picker won't return any results if 'Farsi' is entered, only 'Persian' is recognized as an available lang.
There are some debates what - Farsi vs. Persian - should be used
https://en.wikipedia.org/wiki/Persian_language
Should Mobile apps be consistent with wiki?