The only free and comprehensive online etymological dictionary of the Spanish language
brazo m. (Noun) "arm"
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.
Indo-European
Romance
Asturian brazu, Portuguese braço, Galician brazo, Catalan braç, French bras, Italian braccio, Dalmatian braz, Aromanian brats, Romanian braț, Sardinian baltzu