What does Frīsia mean in Latin?

Frīsia, a proper noun, means “Frisia (a traditionally Frisian-speaking coastal Western Europe, politically split between Netherlands and Germany)”.

What is the genitive of Frīsia?

The genitive singular is Frīsiae. Frīsia is feminine, first declension.

proper noun · femininefirst declension

Frīsia f sg (genitive Frīsiae)

historicalFrisia (a traditionally Frisian-speaking coastal Western Europe, politically split between Netherlands and Germany)

From Frīsiī (“the Frisians”).

Descendants