Romani language
Romani (; also Romany; ) is any of several languages of the Romani people belonging to the Indo-Aryan branch of the Indo-European language family. According to Ethnologue, seven varieties of Romani are divergent enough to be considered languages of their own. The largest of these are Vlax Romani (about 500,000 speakers), Balkan Romani (600,000), and Sinte Romani (300,000). Some Romani communities speak mixed languages based on the surrounding language with retained Romani-derived vocabulary – these are known by linguists as Para-Romani varieties, rather than dialects of the Romani language itself.
Boyash
The Boyash are a branch/caste of the Roma who were forced to settle in the 14th century in the Apuseni Mountains, located in Transylvania, and work as slaves in mining (a regionalism for "mine" in Romanian: "baie," from Middle Age Slavonic). Due to their close proximity with the Romanian-speaking people, they lost the use of the Romani language, and started using the Romanian language. Some groups relearned Romani when they came in contact with other Romani-speaking Roma, after they later emigrated from Romania (for example, in Ecuador).