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Last name origins & meanings:

1. Portuguese or Spanish: habitational name from any of several places called Barros, named with barro ‘loam’, ‘clay’.
2. Hungarian: from a pet form of the personal names Barnabás (see Barnaby) or Bertalan (see Bartholomew).
3. Czech and Slovak (Baroš): from a pet form of the personal name Bartoloměj (see Bartholomew).
4. Polish: from a pet form of a personal name beginning with Bar- (Bartłomiej, Bartołt, or Barnaba).
5. Greek: nickname from Albanian mbarë ‘happy’, ‘lucky’.