köken: Borrowed from English sling, probably from Old Norse slyngja, slyngva (“to hurl”), from Proto-Germanic *slingwaną (“to worm, twist”), from Proto-Indo-European *slenk- (“to turn, twist”).
köken: Uncertain, perhaps from German. Compare Old High German schusser (“clay ball (as a toy)”), itself from German Schuß (“shot”). Suffixed with -i to resolve the word-final consonant cluster, compare cetli from Bavarian zettl or German Zettel (/ˈt͡sɛtl̩/) etc.
köken: Inherited from Proto-Slavic *porkъ. Related to Polish proca, itself akin to Russian праща́ (praščá), Bulgarian пра́шка (práška), Slovene prača, Serbo-Croatian праћа/praća. Perhaps related to práca (“work, labour”).
Possibly from Proto-Indo-European *bʰondʰeh₂, from *bʰendʰ- (“to bind”), whence English bind. Alternatively, a loanword from an unknown language, which may also have been the source of Ancient Greek σφενδόνη (sphendónē, “sling”).