Barnas is a surname of Lithuanian origin. It is a patronymic surname, derived from the personal name Barnabas, which itself has Aramaic roots meaning "son of consolation" or "son of encouragement." The suffix "-as" is a common Lithuanian surname ending.
The surname Barnas, like many surnames, is geographically dispersed, with concentrations likely found in areas with a significant Lithuanian diaspora. Genealogical research would be required to trace specific family lines carrying this name. Spelling variations might exist due to regional dialects or historical transcription errors.