Ar, Ara, found in many river-names; as Aire, Ayr, Aar, Aray, Irvine, Arno, Arve. [Perh. conn. with Sans. ara, 'swift,' 'flowing.']
Ard (Celt.), 'high;' as Ardoch, Airdrie, Ardrossan, Ardglass, Arden, Ardennes.
Ath (Ir. and Gael.), 'a ford;' as Athlone, Athtruim (now Trim), Athole. The Gael. abh, 'water,' appears in Aboyne, Awe.
Auch (Gael.), Agh (Ir.), 'a field;' as Auchinleck, Aghinver, Aghadoe.
Auchter (Gael.), 'summit;' as Auchterarder, Auchtermuchty.
Avon (Celt.), 'a river;' as Avon, Aven, Aisne, Inn, Ain, Vienne; also in Devon, Evan, Guadiana, Punjaub.
Ay. See Ea.
Bab (Ar.), 'a gate;' as Bab-el-mandeb, Bab-el.
Bad (Teut.), 'a bath;' as Bath, Baden, Karlsbad.
Bahr (Ar.), 'a sea,' 'lake,' 'river;' as in Bahrein, Bahar-el-azrak.