Where does “twig” come from?

Twig comes from Old English twigga, from Proto-Germanic twīgą, from Proto-Indo-European dwigʰo-, ultimately from Proto-Indo-European dwóh₁.

twig (English): A small thin branch of a tree or bush; To beat...

Definitions

twig traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Irish	tuig	understand
2	Middle Irish	tuicid	—
3	Old Irish	·tucci	—
4	Proto-Celtic	*unketi	—
5	Proto-Indo-European	*h₁unékti	—

Step	Language	Word	Meaning
1	Middle English	twig	Any part of a tree, especially a branch or...
2	Old English	twīg	twig
3	Proto-West Germanic	*twīg	—