Irish: Dark stranger
Scottish: From the dark river. The Scottish Douglas clan had two historical branches, Black Douglases and Red Douglases. The lords of these clans figure in Sir Walter Scott's novels.
Celtic: Dwells by the dark stream
Anglo-Saxon: Dweller by the dark stream

Similar: Doug , Dougal , Doughal , Doughall , Doughlas , Blas , Dallas , Doughlas , Dubhglas , Nicholas , Douglass