Where does “アメリカ大陸” come from?

アメリカ大陸 (Japanese) comes from Japanese アメリカ, from English America, from Latin America, from Italian Amerigo, from Proto-Germanic *Amalarīks, from Proto-Germanic Haimarīks, from Proto-Germanic rīks, from Proto-Celtic rīxs — to straighten, to right oneself; right; just.

Ancestry of “アメリカ大陸”, step by step

アメリカ大陸 traces back through two separate lines of ancestry.

via Japanese アメリカ

StepLanguageWordMeaning
1JapaneseアメリカAmerica, United States
2EnglishAmerica
3LatinAmerica
4ItalianAmerigo
5Proto-Germanic*Amalarīks
6Proto-GermanicHaimarīksHenry
7Proto-Germanicrīksking, ruler
8Proto-Celticrīxsking
9Proto-Indo-Europeanh₃rḗǵsking, ruler
10Proto-Indo-Europeanh₃reǵ-to straighten, to right oneself; right; just

via Japanese 大陸

StepLanguageWordMeaning
1Japanese大陸a continent; China
Every word from Proto-Indo-European h₃reǵ-Every word from Proto-Indo-European h₃rḗǵsEvery word from Proto-Celtic rīxs