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.
Bohemian Romani
In the early 20th century, Bohemian Romani was, at least in some groups of Bohemian Roma, gradually becoming a non-native ethnic language, acquired in late childhood and used mostly for secretive purposes (cf. Lesný 1916: 214–216, Lípa 1960: 50). Clearly, a development had started toward a Para-Romani variety, that is, a specialized non-native variety spoken by Roma, which has the grammar of a majority language (Czech in this case) as well as an access to Romani-derived lexicon (Elšík 2003: 44).