A common male name, or in some contexts, past tense of 'dig' (though 'dug' is more standard).
From Scandinavian or Germanic origins, 'Doug' is a shortened form of 'Douglas,' which means 'dark water' in Gaelic, becoming popular as an English name.
The name Doug was most popular in the 1950s-60s, and interestingly, names starting with 'D' have been less popular with parents for decades, suggesting our naming trends might be cyclical.
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