Synonyms of gallantry in English:

bravery, braveness, courage, courageousness, valour, pluck, pluckiness, nerve, daring, boldness, fearlessness, dauntlessness, intrepidity, intrepidness, manliness, heroism, doughtiness, stout-heartedness, backbone, spine, spirit, spiritedness, mettle, determination, fortitude

informal guts, grit, spunk, gutsiness, gameness

British informal bottle, ballsiness

North American informal moxie, cojones, sand

vulgar slang balls

chivalry, chivalrousness, gentlemanliness, courtliness, graciousness, respectfulness, respect, courtesy, courteousness, politeness, good manners, mannerliness, attentiveness, consideration, considerateness, thoughtfulness