scapus.

Uncertain, though perhaps ultimately from Proto-Indo-European *skeh₂p- (“rod, shaft, staff, club”). De Vaan suggests that the term could be a borrowing from Ancient Greek σκᾶπος (skâpos, “branch”) or it could more directly derive from the Proto-Indo-European root. Beekes suggests that Latin scāpus, Ancient Greek σκᾶπος (skâpos), and Albanian shkop may derive from an earlier Proto-Indo-European form *skeh₂p-o-, with Proto-Germanic *skaftaz (“shaft, pole”) as a zero-grade cognate and Ancient Greek σκήπτω (skḗptō, “to prop; to hurl, shoot”) a verbal cognate. See also Latin Scipiō and Proto-Slavic *kopьje (“spear, javelin”).