High Quality Content by WIKIPEDIA articles! Tonna (Welsh: Tonnau) is the name of a village and a coterminous electoral ward and community in Neath Port Talbot, Wales, located to the north-east of Neath town, of which it is effectively a suburb. Once mainly agricultural fields, the name derives from the archaic Welsh tonnau, meaning grassland and not, as is sometimes assumed, the modern Welsh for "waves." Some areas of pasture remain.