Narail District is a district in south-western Bangladesh. It is a part of Khulna Division. Narail town was named after a feudal lord. The zamiā¦Narail District is a district in south-western Bangladesh. It is a part of Khulna Division. Narail town was named after a feudal lord. The zamindars established a market at Roopgonj, also named after a zamindar. They established a post office for the first time in the district during British Raj near Rotongonj, named after yet another member of the zamindar's family. They modernised Narail, and promoted culture, sports and education.