Bilberry (especially Vaccinium myrtillus) is also known in English by other names including blaeberry /ˈbleɪbɛri/, whortleberry /ˈhɜrtəlbɛri/, (ground) hurts, whinberry, winberry, windberry, wimberry, myrtle blueberry and fraughan. In several other European languages its name translates as "blueberry", and this may cause confusion with the related plants more usually known as "blueberry" in English, which are in the separate section Cyanococcus of the Vaccinium genus. In Europe including the British Isles the bilberry grows natively in the wild on acidic soils (whereas the blueberry is native to North America).
Ah ha! Bilberries, not seen them for years. They used to grow wild behind our house in Scotland when I was a lass.