Where does “Frisia” come from?

Frisia (Spanish) comes from Latin Frisia, from Latin Frisii, from Proto-Germanic frisaz — curled; curly; crisp.

Ancestry of “Frisia”, step by step

StepLanguageWordMeaning
1LatinFrisiaterritory of the Frisians
2LatinFrisiiFrisians; the Frisians
3Proto-Germanicfrisazcurled; curly; crisp
Every word from Proto-Germanic frisaz