The origin is unknown. Contra M. Bittner (1915b:28) and W. Leslau, hardly any connection with Arb. škk ‘to pierce with the spear’, since Arb. š does not regularly correspond to š in MSA. Note Tgr. sakyät ‘iron-chips that fall off when a sword is whetted; edge of a sword’. (Kogan 2015:571)