Welsh: nickname for a swarthy person, from Welsh du ‘dark’, ‘black’.

Irish: variant of Daw.

English and Scottish: habitational name from a settlement on the banks of the river Dee in Cheshire or either of the rivers so named in Scotland. The origin of both of these is a Celtic word meaning ‘sacred’, ‘goddess’
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Chinese: Romanization of several Chinese surnames, such as Di, and Hokkien pronunciations of Li.