
Leila T. answered 02/13/20
Master of Arts in Language Teaching, Native Farsi Speaker
Hi there. As far as I know, this type of plural originally exists in the Arabic language and since the Persian language has been influenced by the Arabic language, we sometimes see Persian words with a broken plural form. For example, the plural of the word ارمنی which mean Armenian is ارامنه (arâmane)! However, people say ارمنی ها as well!
In Persian, this type of plural is more common when it comes to borrowed Arabic words!
Leila