PS

*nmr - to be brilliant (Bulakh 2005a: 196‒198)

Kogan 2015: 340-341: An Akkadian loanword in Ugaritic postulated in Pardee 1988:115 is quite likely. M. Bulakh (2005a:196‒198) suggests, nevertheless, that the Akkadian and Ugaritic terms are rather related as cognates and go back to PS *nmr ‘to be brilliant,’ presumably attested also in Arb. namir-, namīr- ‘pure, clean’.

Akkadian
namurratu - numinous splendour emanating from gods (CAD N₁ 253, AHw. 730)
Ugaritic
nmrt - splendour (DUL 632, Watson 2007: 98)
Arabic
namir-, namīr- - wholesome, sweet (water) (Lane 2853)
=ˀal-māˀu z-zākī (clean water) (LA 5 276)