Mutañami language
Mutañami ([mu.tæ.ɲæ.ˈmi]) is the language spoken by the Ñikyulakyu, a kali ethnic group in Southwestern Yamahat, Ukilen Union. It is notable for the only recorded case in history of natural language arising from total language deprivation, as well as being the youngest languages in the world, having first been properly "developed" with functional grammar c. 1990.