Where does “Lemmo” come from?

Lemmo (English) comes from Italian Lemmo, from Italian Guglielmo, from Latin Gulielmus, from Proto-West Germanic *Willjahelm, from Proto-Germanic Wiljahelmaz, from Proto-Germanic helmaz, from Proto-Germanic halmaz, from Proto-Indo-European ḱolh₂mos — to pierce, strike; to stick; prick; stab.

Ancestry of “Lemmo”, step by step

StepLanguageWordMeaning
1ItalianLemmolemming
2ItalianGuglielmo—
3LatinGulielmus—
4Proto-West Germanic*Willjahelm—
5Proto-GermanicWiljahelmaz—
6Proto-Germanichelmazhelmet
7Proto-Germanichalmazhalm; stem; stalk; straw; hay
8Proto-Indo-Europeanḱolh₂mosstalk
9Proto-Indo-Europeanḱelh₂-to pierce, strike; to stick; prick; stab
Every word from Proto-Indo-European ḱelh₂- →Every word from Proto-Indo-European ḱolh₂mos →Every word from Proto-Germanic halmaz →