From French -esque (“-ish, -ic, -esque”), from Italian -esco, from Latin -iscus, of Germanic origin, from Lombardic -isc (“-ish”), from Proto-West Germanic *-isk, from Proto-Germanic *-iskaz (“-ish”), from Proto-Indo-European *-iskos.
Cognate with Old High German -isc (German -isch), Old English -isċ, Old Norse -iskr, Gothic -𐌹𐍃𐌺𐍃 (-isks). Doublet of -ish and -ski.