Where does “lancsom” come from?

lancsom (Middle Dutch) comes from Old Dutch langsam, from Proto-West Germanic langasam, from Proto-West Germanic lang, from Proto-Germanic langaz, from Proto-Indo-European dlongʰos — long.

Ancestry of “lancsom”, step by step

StepLanguageWordMeaning
1Old Dutchlangsam—
2Proto-West Germaniclangasamlengthy; drawn-out, long-lasting, extended,...
3Proto-West Germaniclanglong
4Proto-Germaniclangazlong
5Proto-Indo-Europeandlongʰoslong
Every word from Proto-Indo-European dlongʰos →Every word from Proto-Germanic langaz →Every word from Proto-West Germanic lang →