This name's usage should change or at least add the "English (African)" or usage as at least it looks and sounds English or at least European. Or maybe even "French (African)" because it's also used in DRC. Also of Filipino usage. https://forebears.io/x/forenames/filbertAlso the Filbert is very similar to the Hazelnut. https://www.google.com/search?q=Filbert
Yes, as the comment below, this name did not originate in Eastern Africa. I haven't done the research, but I'm fairly confident it existed in Europe first. Maybe someone could update that or verify it.
Only two things I associate this name with: the nut Filbert, and the squirrel from Animal Crossing.
― Anonymous User 1/29/2017
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Filbert the Flea was an early 1950's children's show. The show consisted of a narrator drawing the title character's adventures on a pad and tearing off each page as he continued.
Also of Filipino usage.
https://forebears.io/x/forenames/filbert
Also the Filbert is very similar to the Hazelnut.
https://www.google.com/search?q=Filbert