Most Widely Spoken Languages Only Official in One Country
List the most widely spoken languages only an official language in one country.
Can be co-official or a regional language as long as it is only in one country. For example, if Navajo became official only in the state of North Dakota it would count, but if Saskatchewan also recognized it, then no.
Mostly from this source: https://en.wikipedia.org/wiki/List_of_languages_by_number_of_native_speakers
Hindu and Urdu are grouped together as Hindustani so it does not make the list. Persian has a similar case.