What does Fennus mean in Latin?

Fennus, a noun, means “Finn (person from Finland)”.

What is the genitive of Fennus?

The genitive singular is Fennī. Fennus is masculine, second declension.

In classical Latin, [ˈfɛn.nʊs]; in ecclesiastical (church) Latin, [ˈfɛn.nus].

noun · masculinesecond declension

Fennus m (genitive Fennī, feminine Fenna)

Classical[ˈfɛn.nʊs]Ecclesiastical[ˈfɛn.nus]

declension
form	singular	plural
nominative	Fennus Fenna, Finna	Fennī Fennae, Finnae, Finnī
genitive	Fennī Fennae, Finnae, Finnī	Fennōrum Fennārum, Finnārum, Finnōrum
dative	Fennō Fennae, Finnae, Finnō	Fennīs Finnīs
accusative	Fennum Fennam, Finnam, Finnum	Fennōs Fennās, Finnās, Finnōs
ablative	Fennō Fennā, Finnā, Finnō	Fennīs Finnīs
vocative	Fenne Fenna, Finna, Finne	Fennī Fennae, Finnae, Finnī

Probably from Proto-Germanic *finnaz, compare Old Norse Finnr.

Descendants