Mixed Nuts

I couldn't figure out what the squat, round nuts in our jar of mixed nuts were, so I checked the label. The only nut listed I couldn't readily place was "filbert". Filbert?

filbert
noun
cultivated hazelnut.
[Middle English, from Old French (nois de) filbert, (nut of) Philbert, after Saint Philibert (died 684), whose feast day in late August coincides with the ripening of the nut.]

They're my oldest son's favorites in the whole jar.