Hazelnuts and filberts, yes, they are closely related. Here are some facts.

A chewy bar full of hazelnuts.

From Canadian Living.

A simple recipe for an iced cookie.

An information page of selection and storage of hazelnuts and filberts.

Large assortment including entrees, side dishes, breads, candies, cakes, and other desserts. Features hazelnut butters, flourless baked goods, and prize-winners from the Oregon State Fair.

A bread machine recipe that also uses sunflower and sesame seeds.

Recipes featuring hazelnuts, as well as links to all the recipes that call for specific types of hazelnuts, each with complete nutritional analysis.

A very rich dessert recipe.