Where does “dunker” come from?

dunker (Middle Dutch) comes from Old Dutch dunkal, from Proto-Germanic dunkalaz, from Proto-Indo-European dʰengʷ- — to smoke, fume.

Ancestry of “dunker”, step by step

StepLanguageWordMeaning
1Old Dutchdunkal—
2Proto-Germanicdunkalazdark
3Proto-Indo-Europeandʰengʷ-to smoke, fume
Every word from Proto-Indo-European dʰengʷ- →Every word from Proto-Germanic dunkalaz →Every word from Old Dutch dunkal →