{"era":"1800s–current","word":"billy","meaning":"pet form of William; male goat; police club","children":[{"era":"1200s","word":"Bill / Willy","meaning":"pet forms of William","children":[{"era":"1066–1100","word":"William","meaning":"proper name introduced by Normans","children":[{"era":"pre-1100","word":"Willahelm / Wilhelm","meaning":"resolute protector","children":[{"era":"prehistoric","word":"*welH-","meaning":"to will, to wish","children":[],"language":"Proto-Indo-European"}],"language":"Old High German"}],"language":"Old French Guillaume → Norman English"}],"language":"Middle English"}],"language":"Modern English"}