Where does “Germania” come from?

Germania comes from Latin Germania, formed with the Latin suffix -ia (from Ancient Greek -ία, ultimately from Proto-Indo-European -h₂).

Ancestry of “Germania”, step by step

Step	Language	Word	Meaning
1	Latin	Germānia	—
2	Latin	Germānī	—
3	Latin	Germānus	—
4	Latin	germen	shoot, sprout, bud; germ, seed, origin; embryo,...
5	Proto-Italic	genamen	—
6	Proto-Indo-European	ǵénh₁mn̥	offspring, seed
7	Proto-Indo-European	ǵenh₁-	to produce, to beget, to give birth

Germania — Etymology, Origin & Word History | Etymology Explorer