Formerly in the parish of Fyfield before it merged with Tubney in 1952, it was part of Berkshire until the 1974 boundary changes transferred it to Oxfordshire. The toponym is derived from the Old English neotherra meaning "lower, nether" and dun meaning "hill".
Before merging with Tubney in 1952, this area belonged to the parish of Fyfield; it was part of Berkshire until the 1974 boundary changes transferred it to Oxfordshire. The name is derived from Old English neotherra meaning "lower, nether" and dun meaning "hill".