The Irish version of the name is Baróid in the South and Baréid in the West, this may reflect two separate origins. The surname first appeared in these areas in the thirteenth century, after the Anglo-Norman invasion. Its Norman origin derives it from the old Germanic personal name, Bernard or Beraud. A separate derivation gives its origin as the Middle English "Barat", a nickname for a quarrelsome or deceitful person. According to a pedigree of the Walshes of Mayo compiled in 1588, one "Walynus", who arrived in Ireland in 1169, is said to have been the Progenitor of the Walshes of Tirawley in Co. Mayo, and the brother of Barrett.  

Descendants of Barrett

A : ** Barrett, married Sarah * (born in 1847).
He had 3 children :

B.1 : John Barrett.
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B.2 : Patrick Barrett, born in Carradoogan in 1864, died 1937, married Winifred Deacy (born in 1861 died 1956).
He had 4 children :
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C.2.1 : Martin Barrett, born in Carradoogan in 1904.
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C.2.2 : Thomas Barrett, born in Carradoogan in 1907, died in Carradoogan 1989.
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C.2.3 : Patrick Barrett, born in Carradoogan in 1908.  died accidentally as a small child ,the result of a fall.
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C.2.4 : Mary Barrett, born in Carradoogan in 1910. died Horsham, West Sussex 1984
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B.3 : Thomas Barrett, born in Carradoogan in 1880, died in Tullylinn 1962, married Mary Loftus (born in Graffy, died 1961 in Tullylinn).
He had 5 children :
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C.3.1 : Francis Barrett, born in Tullylinn, married Mary Maye.
He had 5 children :
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C.3.2 : Florence Barrett, born in Tullylinn, married Anthony Clark (Carralavin).
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C.3.3 : Kathleen Barrett, born in Tullylinn, married Ned Ruane (Emlymoran).
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C.3.4 : Theresa Barrett, born in Tullylinn, (emigrated to America).
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C.3.5 : Patrick Barrett, born in Tullylinn, (emigrated to America).