Donau \d(o)-nau\ as a boy's name is a variant of Danube. See for origin and meaning of Donau.

The baby name Donau sounds like Dana, Doan, Don, Donny, Donne, Donn and Dowan. Other similar baby names are Donal, Danar, Danal, Donte, Dontay, Dontae, Dolan, Donnan, Donahue, Donato, Doran, Jona and Jonah.