The name Germany and the other similar-sounding names above are derived from the Latin Germania, of the 3rd century BC, a word of uncertain origin. The name appears to be a Gaulish term, and there is no evidence that it was ever used by the Germans themselves. Julius Caesar was the first to use Germanus in writing when describing tribes in northeastern Gaul in his Commentarii de Bello Gallico; he records that four Belgic tribes, namely, the Condrusi, Eburones, Caeraesi and Paemani, were collectively known as Germani. In 98, Tacitus wrote Germania (the Latin title was actually: De Origine et situ Germanorum), an ethnographic work on the diverse set of Germanic tribes outside the Roman Empire. Unlike Caesar, Tacitus claims that the name Germani was first applied to the Tungri tribe.
Whether the Belgae were Celts or Germanic tribes occupied 19th century and early 20th century historians. Caesar claims that most of the Belgae were descended from tribes who had long ago crossed the Rhine from Germania. However most of the tribal and personal names recorded are identifiably Celtic. It seems likely that the Belgae had a mixture of Celtic and Germanic ancestry. Perhaps they were Germanic people ruled by a Celtic élite, or were a political alliance of Celtic and Germanic tribes, or, like the later Normans, were a formerly Germanic-speaking people who adopted the language of the lands they migrated to. In any case, the Romans were not precise in their ethnography of northern barbarians: by "German" Caesar may simply have meant "originating east of the Rhine", with no distinction of language intended.
The OED2 records theories about the Celtic roots of the Latin word Germania: one is gair, neighbour (a theory of Johann Zeuß, a German historian and Celtic philologist) - in Old Irish gair is "neighbour". Another theory is gairm, battle-cry (put forward by Johann Wachter and Jacob Grimm, who was a philologist as well as writing fairy tales). Yet another theory is that the word comes from ger, "spear"; however, Eric Partridge suggests *gar / gavin, to shout (as Old Irish garim), describing the Germans as noisy. He describes the ger theory as "obsolete".
In English, the word "German" is first attested in 1520, replacing earlier uses of Almain, Alman or Dutch. In German, the word Germanen today refers to Germanic tribes. The English words "german" (as in "cousin-german") and the adjective "germane" are not connected to the name for the country, but come from the Latin germanus, "genuine".
