Filbert \f(i)-lbe-rt, fil-bert\ as a boy's name is of Old German origin, and the meaning of Filbert is "very bright". Saint Philibert was a seventh-century monk who gave his name to a nut, since his feast day falls at the time when the nuts are ripe. In America filberts are commonly known as hazelnuts.
Filbert has 6 variant forms: Bert, Filberte, Filberto, Philbert, Philibert and Phillbert.
For more information, see also the related name Fulbright.