What does Berengarius mean in Latin?

Berengarius, a proper noun, means “a male given name from the Germanic languages, equivalent to English Berengar”.

What is the genitive of Berengarius?

The genitive singular is Berengariī. Berengarius is masculine, second declension.

proper noun · masculinesecond declension

Berengarius m sg (genitive Berengariī)

Ecclesiastical[be.reŋˈɡaː.ri.us]

Medieval Latinmasculinesingulara male given name from the Germanic languages, equivalent to English Berengar

Borrowed from a Germanic language; see Berengar.