Famously, yes in the case of Romani:
http://am.uis.no/getfile.php/Ark…
Through the common vocabulary of all the Romani dialects, we can trace their migration from India, through Iran, Georgia and Armenia, to Greece/Anatolia, to Romania. After Romania there is a dispersal throughout Europe: there is no further common vocabulary between Romani dialects.
(from: Romani people, though this map seems to use historical and not just linguistic evidence)