Where does “Australaasia” come from?

Australaasia (Finnish) comes from French Australasie, from Latin australis, from Latin auster, from Proto-Italic *austeros.

Ancestry of “Australaasia”, step by step

StepLanguageWordMeaning
1FrenchAustralasie
2Latinaustralissouthern; Australian; the south pole
3LatinausterThe south wind; south
4Proto-Italic*austeros
Every word from Proto-Italic *austeros