Where does “twisil” come from?

twisil (Middle English) comes from Old English twisel, from Old English twisla, from Proto-Germanic twisilą, from Proto-Indo-European dwis- — two-ways, in twain; twice, in two.

Ancestry of “twisil”, step by step

StepLanguageWordMeaning
1Old Englishtwiselforked, double
2Old Englishtwislathe fork of a river, road, etc
3Proto-Germanictwisiląfork, bifurcation
4Proto-Indo-Europeandwis-two-ways, in twain; twice, in two
Every word from Proto-Indo-European dwis- →Every word from Proto-Germanic twisilą →Every word from Old English twisla →