A very early 15th cent. metathesis of Old Spanish frauga, which dates back to the early 13th cent. From Vulgar Latin *faurga 'id.,' and that from Latin fabrica "workshop," taken from a prehistoric Italic phrase *ars fabrica "artisan work." For continued etymologies, see arte and fabro respectively.
Asturian fragua, Portuguese frágua, Galician fragua, Catalan farga, Italian fabbro, Aromanian favru, Romanian faur, Sardinian frau