What does Mathia mean in Latin?

Mathia, a proper noun, means “Mat (a river in Albania)”.

What is the genitive of Mathia?

The genitive singular is Mathiae. Mathia is feminine, first declension.

proper noun · femininefirst declension

Mathia f sg (genitive Mathiae)

From earlier Mathis + -ia, perhaps related to Albanian mat (“riverbank”).

What does Mathia mean in Latin?: Mathia, a proper noun, means “Mat (a river in Albania)”.
What is the genitive of Mathia?: The genitive singular is Mathiae. Mathia is feminine, first declension.