Where does “hellweed” come from?

hellweed (English) comes from English Hell, from German hellen, from Middle High German hëllen, from Old High German hëllan, from Proto-Germanic hellaną, from Proto-Indo-European ḱelh₁- — to warm up, to be hot; to warm up, be hot.

Ancestry of “hellweed”, step by step

hellweed traces back through two separate lines of ancestry.

via English Hell

StepLanguageWordMeaning
1EnglishHellAny of various places so named
2Germanhellento brighten
3Middle High Germanhëllento sound, to resound, to ring out; to echo
4Old High Germanhëllan
5Proto-Germanichellanąto resound, make a sound
6Proto-Indo-Europeanḱelh₁-to warm up, to be hot; to warm up, be hot

via English weed

StepLanguageWordMeaning
1EnglishweedAny plant regarded as unwanted at the place...
2Middle Englishweed
3Old Englishwēodweed
4Proto-West Germanic*weudweed (unwanted plant)
Every word from Proto-Indo-European ḱelh₁-Every word from Proto-Germanic hellanąEvery word from Old High German hëllan