Proto-MSA

*ˁardVb- - nape (Kogan 2015:550)

The etymology is unknown.

Jibbali

ˁardéb - nape of the neck (Kogan 2015:549)

Soqotri

ˁarédɛb - neck (LS 326; CSOL II 414; Simeone-Senelle–Lonnet 1991:1452)

In di-ˁarédɛb (‘that of the neck’):

férhim di-sáṭahan be-ˀerbéboʰ múgšem di-sáṭahan be-di-ˁarédɛb ‘The sultan’s daughter is on my thigh! The sultan’s son is on my neck!’ (CSOL II 28:54)