While it well known that in later imperial times Germanic speaking "Germani" made there way to the Rhine, and across, in the time of Caesar the evidence for the presence of Germanic languages is limited to placename analyses such as those of Maurits Gysseling and not universally accepted.
When Julius Caesar first entered this area and took it under Roman control it was inhabited by a group of Belgic Gaulish tribes, the Condrusi, Eburones, Caeraesi, Segni and Paemani, who were referred to collectively as the Germani cisrhenani.