Where does “World War II” come from?

World War II (English) comes from English two, from Middle English two, from Old English twā, from Old English twēġen, from Proto-West Germanic twai-, from Proto-Germanic twai, from Proto-Indo-European dwóh₁ — two.

World War II (English): The war from 1939 to 1945 of the Allied forces, including the United Kingdom, the Soviet Union, the United States, France, and China, against the Axis Powers, including Germany, Italy, and Japan

Definitions

  1. The war from 1939 to 1945 of the Allied forces, including the United Kingdom, the Soviet Union, the United States, France, and China, against the Axis Powers, including Germany, Italy, and Japan

Ancestry of “World War II”, step by step

World War II traces back through two separate lines of ancestry.

via English two

StepLanguageWordMeaning
1EnglishtwoA numerical value equal to 2; this many dots;...
2Middle Englishtwotwo
3Old Englishtwātwo
4Old Englishtwēġentwo; twain
5Proto-West Germanictwai-two
6Proto-Germanictwaitwo
7Proto-Indo-Europeandwóh₁two

via English World War

StepLanguageWordMeaning
1EnglishWorld WarWorld War I

Words derived from “World War II”

Every word from Proto-Indo-European dwóh₁ →Every word from Proto-Germanic twai →Every word from Proto-West Germanic twai- →