Where does “Willi” come from?

Willi (English) comes from German Willi, from Slovak víly, from Swedish víla, from Swedish plats, from Old Swedish platz, from Old Norse plaz, from Middle Low German platse, from Latin platēa — flat.

Ancestry of “Willi”, step by step

StepLanguageWordMeaning
1GermanWilliwilly, penis
2Slovakvíly
3Swedishvílafairy
4Swedishplatsplace; any geographical position a little larger...
5Old Swedishplatz
6Old Norseplaz
7Middle Low Germanplatse
8Latinplatēabroad way, street
9Ancient Greekπλατεῖαfeminine nominative singular of πλατύς; feminine...
10Ancient Greekπλατύςwide, broad; flat, level; broad-shouldered
11Proto-Indo-Europeanpléth₂usflat, broad
12Proto-Indo-Europeanpleth₂-flat
Every word from Proto-Indo-European pleth₂-Every word from Proto-Indo-European pléth₂usEvery word from Ancient Greek πλατύς