Where does “yard dart” come from?

yard dart (English) comes from English Yard, from English milliard, from French milliard, from French million, from Middle French million, from Old French millon, from Italian milione, from Italian mille.

Ancestry of “yard dart”, step by step

yard dart traces back through two separate lines of ancestry.

via English Yard

StepLanguageWordMeaning
1EnglishYardScotland Yard or New Scotland Yard
2Englishmilliard10, a thousand million
3FrenchmilliardA milliard
4Frenchmillionmillion, 10
5Middle Frenchmillionmillion, 10
6Old Frenchmillon
7Italianmilionemillion
8Italianmillethousand
9LatinMīllethousand; 1000
10Proto-Italicsmīɣeslīthousand
11Proto-Indo-Europeansmih₂ǵʰéslih₂

via English dart

StepLanguageWordMeaning
1EnglishdartA pointed missile weapon, intended to be thrown...
2Middle EnglishdartA hand-thrown spear or missile; a javelin;...
3Old Frenchdartspear, javelin
4Medieval Latindardusspear
5Frankishdarōþuthrowing spear, arrow; dart, spear; light spear,...
6Proto-Germanicdarōþuza light spear; javelin; dart
7Proto-Germanic-ōþuzForms nouns from weak class 2 verbs, possibly...
8Proto-Germanic-þuzForms result nouns from verb roots, usually from...
9Proto-Indo-European-tusDerives action nouns from verb roots
Every word from Proto-Indo-European smih₂ǵʰéslih₂Every word from Proto-Italic smīɣeslīEvery word from Latin Mīlle