The story
From standard + -ish. Etymology tree Proto-Indo-European *steh₂-der. Proto-Germanic *standaną Frankish *standan Proto-Indo-European *kret-der.? Proto-Germanic *harduz Proto-Indo-European *-yos Proto-Indo-European *-yós Proto-Germanic *-jaz Proto-West Germanic *-ī Frankish *hard(ī) Frankish *standahardbor.? Old French estendre? Old French estandartbor. Middle English standard English standard Proto-Indo-European *-iskos Proto-Germanic *-iskaz Proto-West Germanic *-isk Old English -isċ Middle English -isch English -ish English standardish
Etymology from Wiktionary, CC BY-SA 4.0.