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Last name origins & meanings:

1. French (Dubé): of uncertain origin. It may be a habitational name for someone from any of various places called Le Bec, which are named either from Gaulish becco ‘high ground’ or from Germanic bec ‘stream’ (see Beck).
2. Breton: nickname meaning ‘pigeon’.
3. Eastern German, Sorbian, or other Slavic: from Sorbian or Slavic dub ‘oak’, hence a nickname for a strong or solid man, a topographic name for someone who lived by a prominent oak or in an area where oak trees were abundant, or a habitational name for someone from a place named with this word, for example Dubá or Doubé, both frequent Czech place names.
4. North German: variant of Duwe.
5. Indian (northern states); pronounced as two syllables: Hindu (Brahman) name meaning ‘one who knows (or has studied) two Vedas’, from Sanskrit dvivedī ‘one who knows two Vedas’, from dvi ‘two’ + veda ‘Veda’, ‘knowledge’. This name is a cognate of Gujarati Dave.
6. A Poitevin family of this name had settled in Île d’Orléans before 1670.