Wikipedia
Judeo-Latin
'''Judeo-Latin '''(also Judæo-Latin), La‘az, or Ebraico-Latino is a presumed Jewish language for many scattered Jewish communities of the former Roman Empire, but especially by the Jewish communities of the Italian Peninsula and Transalpine Gaul.
"La`az" (לעז) is Hebrew for "foreign language" (i.e., specifically, "non-Hebrew language"), and in the Middle Ages started to refer to Latin or Romance languages.
It is believed that Judæo-Latin is the predecessor of all the Judæo-Romance languages.*Blondheim, D. S. 1927. Poèmes judéo-français du Moyen Age. Paris: Champion
- WEINREICH, Max (1956). The Jewish languages of Romance stock and their relation to earliest Yiddish. RPh 9: 403-428.