What is the least spoken main language of a country?

It's tricky to definitively say which country has the least spoken main language because "main language" is a somewhat subjective term. It can be defined as the official language, the language with the most speakers, or the language with the most significant cultural influence.

However, we can look at some contenders for countries with languages spoken by a relatively small number of people:

* Nauru: Nauruan, the official language, is spoken by only about 10,000 people, mainly on the island nation of Nauru. English is also widely used.

* Tuvalu: Tuvaluan, the official language, is spoken by only about 11,000 people, primarily on the small island nation of Tuvalu. English is also widely used.

* Palau: Palauan, the official language, is spoken by about 15,000 people, mainly on the island nation of Palau. English is also widely used.

* Tonga: Tongan, the official language, is spoken by about 100,000 people, mainly in the island nation of Tonga. English is also widely used.

These are just a few examples. There are many other countries with relatively small-speaking main languages, often found on smaller islands or in isolated regions.

It's important to note that the number of speakers can fluctuate depending on factors like migration, education policies, and globalization.