An Etymological Dictionary of the German Language/nun
nun, adv., ‘now, at present,’ from MidHG. and OHG. nu (with the variant nû), ‘at the present time, now,’ rarely in MidHG. with the adverbial suffix n (nun, nuon). Further in ModHG. nu (from MidHG. n); corresponding to OSax. nū̆, Du. nu, AS. nū̆, E. now, Goth. nū̆, ‘now.’ A common Teut. temporal adv.; comp. Sans. nu, nû, ‘now,’ nûnam, ‘now,’ Gr. νύ, νῦν, Lat. nunc (with the c of hi-c), OSlov. nyně, ‘now,’ Lith. nu. Comp. neu and noch (1).