Douglas

Anglicized form of the Scottish surname Dubhghlas, meaning "dark river" from Gaelic dubh "dark" and glais "water, river". Douglas was originally a river name, which then became a Scottish clan name (belonging to a powerful line of Scottish earls). It has been used as a given name since the 16th century.

EQUIVALENTS
ENGLISH: Douglas
SCOTTISH: Douglas, Douglass, Dubhghlas
DIMINUTIVES AND SHORT FORMS
ENGLISH: Doug