confined to the cluster -mb-. There it is an allophone of /n/ before a labial. The third is the absence of word-initial /r/. Of about 600 indigenous names recorded in Aquitania, only one begins with R-, and that one is Gaulish. Iberian and Basque share this restriction, and Basque keeps it to the present. Latin rota(m) gives Basque errota 'mill', and rege(m) gives errege 'king'.

The names also show that Aquitanian preserved phonological states older than those of historical Basque. The element Seni- ('boy') still has the single intervocalic