köken: Uncertain. Maybe from Proto-Indo-Aryan *aktúṣ, from Proto-Indo-Iranian *aktúš, an ablaut variant of Proto-Indo-European *nokʷt-ú-s (“night”); compare, though with potential phonetic and semantic issues, Ancient Greek ἀκτίς (aktís, “ray, beam”). Both the Greek and Sanskrit words are traditionally assigned to a root *h₂ek-t- (“ray, beam”), but this fails to explain the “night” and related senses…
Etimoloji
From Middle High German nahtes, from Old High German nahtes, equivalent to the adverbial solidified genitive of Nacht (“night”), analogical form to tags. Cognate with English nights (adverb).