灰 'grey' translates the French 'gris' / Italian 'grigio'. Part of the
皮诺 (Pínuò, 'Pinot') family in Chinese:
黑皮诺 (Hēipínuò) Pinot Noir,
白皮诺 (Báipínuò) Pinot Blanc,
灰皮诺 Pinot Gris. The fact that
皮诺 also resembles English 'Pinot' phonetically is a happy coincidence rather than a deliberate transliteration choice.