Mosquito
late 16th century: from Spanish and Portuguese, diminutive of mosca, from Latin musca ‘fly’.
wiktionary
Borrowed from Spanish mosquito(“gnat”), diminutive of mosca(“fly”), from Latin musca(“fly”), from Proto-Indo-European *mūs-(“fly, stinging fly, gnat”). Cognate with West Flemish meuzie(“mosquito”), dialectal Swedish mausa(“mosquito”), Lithuanian musė(“a fly”) and Sicilian muschitta(“midge”). See also midge.
etymonline
mosquito (n.)
name given to gnat-like insects the females of which bite animals and draw blood through a piercing and sucking proboscis, 1580s, from Spanish mosquito "little gnat," diminutive of mosca "fly," from Latin musca "fly," from PIE root *mu- "gnat, fly" (compare Sanskrit maksa-, Greek myia, Old English mycg, Modern English midge, Old Church Slavonic mucha), perhaps imitative of the sound of humming insects. Related: Mosquital. Mosquito-hawk as a name for a kind of dragon-fly which preys on mosquitoes is from 1737. Mosquito-net "gauze or other fabric used as a screen against mosquitoes" is from 1745.
