11th cent. From Latin bracchium 'id.' Borrowed from Ancient Greek βραχίων (brakhíon) 'id.'
Of unknown origin.
Also responsible for the surnames Brazo and Brazos, given to men in respect of their physical strength.
Asturian brazu, Portuguese braço, Galician brazo, Catalan braç, French bras, Italian braccio, Dalmatian braz, Aromanian brats, Romanian braț, Sardinian baltzu