Where does “Willemsen” come from?

Willemsen (English) comes from Dutch Willemsen, from Dutch Willem, from Middle Dutch willem, from Old Dutch *Willihelm, 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 “Willemsen”, step by step

StepLanguageWordMeaning
1DutchWillemsen
2DutchWillem
3Middle DutchwillemA male given name
4Old Dutch*Willihelm
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-