An Etymological Dictionary of the German Language/Ramme
Ramme, f., from the equiv. MidHG. (MidG.) ramme, f., ‘rammer, pile-driver,’ prop. identical with MidHG. ram (gen. rammes), m., ‘ram,’ OHG. ram, rammo, m., ‘ram’ (comp. Bock, Krahn); corresponding to Du. ram, ‘ram, battering-ram,’ AS. ramm, E. ram. No connection with Gr. ἀρήν is possible; it is more probably allied to OIc. ramr, rammr, ‘strong, sharp, powerful.’ See the following word.