Etymology
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buckaroo (n.)

"cowboy," 1907, American English, earlier buckayro (1889), bakhara (1827), from Spanish vaquero "cowboy," from vaca "cow," from Latin vacca, a word of uncertain origin. Spelling altered by influence of buck (n.1).

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Definitions of buckaroo

buckaroo (n.)
local names for a cowboy (`vaquero' is used especially in southwestern and central Texas and `buckaroo' is used especially in California);
Synonyms: vaquero / buckeroo
From wordnet.princeton.edu