Germanic names

[Chilperic]

We also know of Tailali in southern France, completely undetectable but for some slight evidence through some place-names.

Not quite (if I understand you correctly). Gregory of Tours mentions the Taifali of Poitou on two or three occasions in the Ten Books of Histories and in The Life of the Fathers. There is a praefectus laetorum in the area according to the Notitia. Of course exactly when these people were settled there is by no means clear.

The same goes for dozens of Alan settlements in France and Italy during the 5th c.

Except that the sole evidence for these 'dozens' of Alanic settlements in France is the sort of dubious place-name evidence, and nineteenth-century reading thereof, that you castigated in your other post. Historically the only Alan settlements attested in Gaul are one in or near Valence and one in 'Gallia Ulterior' in the region of Auxerre.

Cheers,
Guy