Where does “Billy” come from?

Billy is an English diminutive of William, which derives from Anglo-Norman Willame.

Billy (English): The 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

Definitions

  1. The 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

Ancestry of “Billy”, step by step

StepLanguageWordMeaning
1EnglishBillA nickname for the British constabulary. Often called "The Bill" or "Old Bill"
2Middle Englishbill
3Old Englishbila kind of sword or other bladed weapon,...
4Frankishbilli
5Proto-Germanicbiljąa cutting implement; blade; axe; sword; spike;...
6Proto-Germanicharjazarmy; army leader; commander; warrior
7Proto-Indo-Europeankóryoswar; troops; army; war, troops
8Proto-Indo-Europeanḱer-to grow, to make grow, to nourish; to plait,...
9Proto-Indo-Europeankr̥-to turn, to bend
10Proto-Indo-Europeanker-army

Words derived from “Billy

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