Dewain \de-wain\ as a boy's name is a variant of Duane (Irish, Gaelic), and the meaning of Dewain is "dark, swarthy".

The baby name Dewain sounds like Dwain and Duwain. Other similar baby names are Dain, Dekwan, Derrin, Derwin, Deylin, Dewayne, Devaun, Deakin, Dean, Delainy, Delaine, Delwin, Devin, Devan, Dewie, Dewi, Dowan, Dwaine, Duwaine, Gawain, Owain, Swain and Twain.