(Gelderland) Attested as Vijfhoek (De) in 1899. Derived from vijfhoek(“pentagon”). The toponym might be a reference to the pentagonal shape of the village, but it could also refer to a brewery, mill, or inn (all of these often had signs featuring a pentagon).
(Overijssel) Derived from vijfhoek(“pentagon”). The toponym references the numbers of sub-neighbourhoods within the larger neighbourhood.