An Etymological Dictionary of the German Language/August

by Friedrich Kluge

August, m., formed, after being based anew on Lat. and Rom. augustus, from the equiv. MidHG. ougest, ougeste, OHG. augusto, agusto, m., ‘August’ (the genuine OGerm. term is Erntemonat, OHG. aran-mânôt). Comp. Fr. août, Ital. agosto. It was borrowed in OHG. at the same time as März and Mai.