Where does “Ақнұр” come from?

Ақнұр (Kazakh) comes from Kazakh ақ, from Proto-Turkic Āk — white.

Ancestry of “Ақнұр”, step by step

Step	Language	Word	Meaning
1	Kazakh	ақ	white; clean, pure, saintly; pertaining to...
2	Proto-Turkic	Āk	white