A derivation from PS *ŝaˁr- ‘hair,’ assumed as certain in Fronzaroli 1969: 12‒13 and elsewhere in Semitological studies, is difficult to prove, although a contamination with this widespread
anatomical term cannot be excluded.
PS
*ŝVbVr- - buttocks, hind parts, small of the back
(SED I No. 262)
PS
*ŝadaw- - open country, wild, uncultivated place
(Fronzaroli 1968: 269‒270, 287; Kogan 2011: 190; Kogan 2015: 307)
reconstruction with *-w (rather than -y) seems to be assured by well-attested spellings with -u-/-w- in Sargonic (śa-dú-e, śa-dú-im) and Old Assyrian (ša-ad-wi-im, ša-du-im), v. Kienast 1994:278‒280 and CAD Š₁ 51 respectively
Kogan 2015: “It is uncertain to what extent *ŝahr- was synonymous to *war(i)ḫ- in PS: could the former designate specifically the “new moon,” “crescent”?”