PS

*ḏaḳan- - beard (SED I No. 63, Kogan 2011: 223)

PCS
*ḏḳn - to grow old (Kogan 2015: 428)

Akkadian
ziḳnu - beard (CAD Z 125, AHw. 1530)
Ebla
ša-ga-núm, sa-gu-nu-um /ḏaḳa/ūnum/ - SU₆.DÙ (VE 199; Krebernik 1983: 8)
Ugaritic
dḳn - beard (DLU 135)
Phoenician
zḳn - beard (Tomback 1978: 95)
Hebrew
zāḳān - side whiskers and (pointed) beard (HALOT 278)
Jewish Palestinian Aramaic
dḳn - beard (DJPA 154)
det. dyḳnh
Syriac
daḳnā - beard (LSyr. 164, SL 318)
Maalula
ḏeḳna - Bart (beard) (GNDM 22)
Arabic
ḏaqan- - beard (BK 1 776, Lane 267)
Arabic
ḏiqn- - extremely aged man (BK 1 775, Lane 967)
Soqotri
díḳehon - beard (LS 134)