Where does “Aquitânia” come from?

Aquitânia (Portuguese) comes from Latin Aquitania, from Latin aqua, from Proto-Italic akʷā, from Proto-Indo-European h₂ekʷeh₂ — water, flowing water.

Ancestry of “Aquitânia”, step by step

StepLanguageWordMeaning
1LatinAquitaniaAquitaine
2Latinaquawater
3Proto-Italicakʷāwater
4Proto-Indo-Europeanh₂ekʷeh₂water, flowing water
Every word from Proto-Indo-European h₂ekʷeh₂ →Every word from Proto-Italic akʷā →Every word from Latin aqua →