The name Duna is a girl's name of Hungarian, Icelandic origin meaning "eiderdown". Duna and is often added to lists like Names That Mean Water and discussed in our forums with posts like "Picky Parents - Sibsets Version".
From the experts:
Duna refers the Hungarian word for the Danube River or to the Icelandic term for the down of a duck. Duna also bears a resemblance to both Dune and Djuna. In this era of word names and invented names, Duna may have a bright future.