Suer derives from SUER-, the stem of Latin sus (‘pig’). However, FEW classifies forms like souére ('truie en chaleur') under the entry subare ('brünstig sein'; 12,328a), and soire/sueri ('truie') as forms of unknown origins (see FEW 22/ii,4). The nominative sus is also found in Anglo-Norman (see sus²). DMF has the entry suaire 'truie', and suggests that substantival forms derived from suarius (see suer⁵) can also means 'sow'.