Origin: 1580–90; < Middle French mousquet < Italian moschetto crossbow arrow, later musket, orig. kind of hawk, equivalent to mosch(a) fly (< Latin musca) + -etto-et
"firearm for infantry," 1580s, from M.Fr. mousquette, a kind of sparrow-hawk, dim. of mosca "a fly," from L. musca (see midge). The hawk so called either for its size or because it looks speckled when in flight. Early firearms were often given names of beasts (cf. dragoon),
and the equivalent word was used in It. to mean "an arrow for a crossbow." The M.Fr. word was borrowed earlier (early 15c.) in its literal sense of "sparrow-hawk."