Where does “now” come from?

now (Middle English) comes from Old English nū, from Proto-West Germanic *nū, from Proto-Germanic nu, from Proto-Indo-European nū — now.

Ancestry of “now”, step by step

Step	Language	Word	Meaning
1	Old English	nū	now, at present, at this time, immediately, very...
2	Proto-West Germanic	*nū	—
3	Proto-Germanic	nu	now
4	Proto-Indo-European	nū	now

now — Etymology, Origin & Word History | Etymology Explorer