Lishán Didán is the vernacular language of the Jewish people in Urmia, Iran. Aramaic itself was the lingua franca of Mesopotamia. The many dialects of the ancient language began losing popularity in favor of Arabic with the rise of the Arabian Empire. However, many Jewish and Christian communities in the near east held onto features of their mother tongues, leading to the formation of Neo-Aramaic.
Lishán Didán is a part of a dialect group called North Eastern Neo Aramaic. A map that showcases the names and locations of these dialects is below. Note that Lishán Didán is referred to as Urmi, as it was spoken by Jews in Urmia. Many of the dialects center around North-Eastern Iraq, which leads scholars to believe that the dialects in Western Iran and South-Eastern Turkey were spoken by communities that migrated from Iraq.
Lishán Didán has no written vocabulary. It was a vernacular language for the Jewish community in North-Western Iran. In addition, most Lishán Didán speakers are now in diaspora, leading to the moribund state of the language.