Where does “billy” come from?

Billy derives from the English given name William, which comes from Anglo-Norman Willame, though the semantic connection between the personal name and its common noun usage remains unclear.

billy (English): A billy club; A billy goat; A good friend

Definitions

  1. A billy club; A billy goat; A good friend

Ancestry of “billy”, step by step

StepLanguageWordMeaning
1EnglishBillyThe B-25 twin-engine bomber aircraft used during World War Two, commonly called the "B-25 Mitchell" in honor of U.S. Army General William "Billy" Mitchell
2EnglishBillA nickname for the British constabulary. Often called "The Bill" or "Old Bill"
3Middle Englishbill
4Old Englishbila kind of sword or other bladed weapon,...
5Frankishbilli
6Proto-Germanicbiljąa cutting implement; blade; axe; sword; spike;...
7Proto-Germanicharjazarmy; army leader; commander; warrior
8Proto-Indo-Europeankóryoswar; troops; army; war, troops
9Proto-Indo-Europeanḱer-to grow, to make grow, to nourish; to plait,...
10Proto-Indo-Europeankr̥-to turn, to bend
11Proto-Indo-Europeanker-army

Words derived from “billy

Every word from Proto-Indo-European ker-
billy — Etymology, Origin & Word History | Etymology Explorer