Pinot

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French, denoting a type of vine, variant of earlier Pineau, diminutive of pin ‘pine’ (because of the shape of the grape cluster).

wiktionary

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Borrowed from French pinot, a type of vine, from earlier pineau.

etymonline

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pinot (n.)

type of grape vine used in wine-making, 1912, American English variant spelling of French pineau (attested in English from 1763), name of a family of wine grapes, from pin "pine tree" (see pine (n.)) + diminutive suffix -eau. So called from the shape of the grape clusters. Variants are pinot noir, "black," pinot blanc, "white," and pinot gris, "gray."