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Very interesting !

Originally Posted by
Taranis
However, in the northern areas of Germania (with exception of the Rhine delta), Celtic place names are absent, even if archaeologically Hallstatt/Le-Tene extended into these areas.
First, it is very important to emphasize the fact that their is no obligatory connection between an archaeological culture and a language family. It has been said hundreeds of times, but it is still crucial. La Tène and Halstatt are considered Celtic on the basis of a very thin argumentation, and several "laténiennes" areas are obviously not Celtic (eg. in Hungary).
However, a few Celtic ethnonyms and place-names can be found in southern Jutland and Northern Germany : Ampsivarii and Chauci, the river name Amisia, the place name Abalus, the controversed ethnonym Teutones and some others. Their celticity is not 100% certain (see Sims-Williams : Ancient Celtic Place-Names in Europe and Asia Minor, Blackwell 2006).

Originally Posted by
Taranis
- On the flip side, the Germanic languages have a considerable number of borrowings from the Celtic languages. In particular, they must have occured before in particular the shift of Initial K to H occured in Common Germanic. To pick a few signature examples:
- The Celtic tribal name "Volcae" yields "Walha" ('foreigner' - which we find today in place names like "Wales", "Wallonia" and "Wallachia").
In your example Volcae/Walha, *k has already undergone the spirantisation of the PIE velars predicted by Grimm's Law. Could you give another example ? There are very few cases of germanic-celtic words attested in both languages dating back to 600 BC. My guess would be that if a word has not been submitted to Grimm's Law, then it is not Germanic.

Originally Posted by
Taranis
As stated above with the personal names, these names strike us as surprisingly Celtic.
Maybe because they are !

Originally Posted by
Taranis
Now, if we account for the absence of sound changes, it's possible to reconstruct this "Pre-Germanic" stage, as examplified by the word for "tribe" or "people":
Singular
Case - Gaulish - Pre-Germanic - Gothic
Nominative - Touta - Teuta - Θiuda
Genitive - Toutas - Teutas - Θiudos
Dative - Toutai - Teutai - Θiudai
Accusative - Toutan - Teutan - Θiuda
Plural
Case - Gaulish - Pre-Germanic - Gothic
Nominative - Toutas - Teutas - Θiudos
Genitive - Toutanom - Teuton - Θiudo
Dative - Toutabo - Teutamis - Θiudom
Accusative - Toutas - Teutas - Θiudos
Note that with exception of genitive and dative plural, these forms are near-identical. There's a few uncertainties to be considered however:
(For Gaulish I would say respectively : sing: touta - toutias - touti - toutin/im) If you compare with Old Greek, you will see that the endings are very similar too.

Originally Posted by
Taranis
The Pre-Germanic language and the Celtic languages (ie, Gaulish - and related dialects/languages spoken by the Hallstatt/La-Tene peoples) probably had a considerably degree of mutual intelligibility. This, in a way, mirrors the similarities of Gaulish and Latin, and could explain the archaeological/linguistic discrepancies. It would also account for Caesar's account of the so-called "Germanic" Belgae (which - for the greater part, all bear overtly Celtic - that is, essentially Gaulish - tribal and personal names): if these crossed the Rhine in earlier times, it would have been relatively easy for them to adopt the Gaulish language.
That's interesting, but the core Germanic and Celtic lexicons have both many pre-IE items that would have made the mutual understanding completely impossible. The same for Celtic and Italic. Moreover, you assume that Gaulish and Pre-Germanic have been spoken at the same time, while it would be more logical to assume that Pre-Germanic was spoken at the same time than pre- or at least proto-Celtic. In fact, the closer you go to PIE, the more the IE languages are similar to each others.

Originally Posted by
Taranis
While this may sound a tad unlikely at first glance, one must consider that for instance Irish language made similarly drastic changes in a very short time frame between roughly 7th to 8th century AD), as it attested by the massive differences between Primitive Irish (the language used in the Ogham inscriptions - which in many aspects is much closer to Gaulish than to modern Irish) and the later Old Irish of the early medieval times.
That's right. Now the question is : why ? If, on the contrary, you compared archaic Greek (Mycenean) with modern Greek, you would be surprised by the phonetic stability through a time span of 3500 years.