According to Leslau [EDG 511], ḳəṭay is from ḳäṭälä ‘to attach one thing to another’ with l palatalized into y (on «occasional loss of l» in Amh. see [LGz. XXVI]).
Attested in South-Semitic area only. Meanings in Arb., Gez. and Soq. rather diverse; S. Eth. forms may be of a different origin.
Ugr. ḳmṣ also likely belongs to this root (Kogan 2015:336, with fn. 989).