Soqotri

néḳi - to be clean (LS 273; CSOL II 554; Bulakh et al. 2021:280)

PCS
*nḳy - to be clean (Kogan 2015: 216)
Origin uncertain. Hardly any connection with Akk. naḳû ‘to pour out as a libation’ (Kogan 2015: 216).