The story
- Anglo-Norman · derived fromnoix de filbert
- Middle English · inherited fromfilbert-note
- English todayfilbert
Earlier filbert-nut, Philibert-nut, from Middle English filbert-note, from Anglo-Norman noix de filbert, so named because they are ripe near Saint Philibert’s Day.
Etymology from Wiktionary, CC BY-SA 4.0.