Where does “Japonia” come from?

Japonia (Ido) comes from Latin Iaponia, from Latin -ia, from Latin -ius, from Proto-Italic -jōs, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

Ancestry of “Japonia”, step by step

Step	Language	Word	Meaning
1	Latin	Iaponia	Japan
2	Latin	-ia	Used to form a feminine abstract noun, usually...
3	Latin	-ius	forming adjectives from nouns; nominative neuter...
4	Proto-Italic	-jōs	Forms comparative adjectives
5	Proto-Indo-European	-yós	Creates adjectives from noun or verb stems

Words derived from “Japonia”

Japoniano

Every word from Proto-Indo-European -yós →Every word from Latin -ia →Every word from Latin -ius →