PCS

*ktb - to write (Kogan 2015: 213)

PWS
*ktb - to sting, to carve (Kogan 2015: 213)

Ugaritic
ktb - to write (DUL 468)
Hapax legomenon in 2.19:8‒9: nḳmd mlk ˀugrt ktb spr hnd ‘Niqmaddu, the king of Ugarit, wrote this document.’
Hebrew
ktb - to write (HALOT 503)
Syriac
ktb - to write (LSyr. 351, SL 660)
Arabic
ktb - to write (Lane 2589)
Geez
kətāb - writing, message, letter, book (CDG 297)
likely borrowed from Arabic
Mehri
kətūb - to write (ML 217)
likely borrowed from Arabic
Jibbali
ktɔb - to write (JL 137)
likely borrowed from Arabic