Rottum

Etymology

 * (Friesland) First attested as ruthne in 1132. Etymology . Potentially derived from an ancient hydronym derived from 🇨🇬. Compare.
 * (Groningen) First attested as rotton in the 10th or 11th century. Etymology uncertain. Potentially derived from an ancient hydronym, derived in turn from a term cognate to the element raad in or from 🇨🇬.