An Etymological Dictionary of the German Language/Banner
Banner, m., ‘banner, militia,’ from MidHG. baner, more usual banier, baniere, f., from Fr. bannière, which has been derived from the stem of Goth. bandwa, bandwô, ‘sign.’ Comp. MidLat. bandum in Paul the Deacon, ‘vexillum quod bandum appellant. See Panier.