Hobo

google

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late 19th century: of unknown origin.

wiktionary

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Unknown. Possibly a term for a stowaway traveler out of the Hoboken, NJ train yards, or a contraction of ho, boy, or the dialectal English term hawbuck(“lout, clumsy fellow, country bumpkin”). It could also be an abbreviation for homeless boy, homeward bound, or homeless Bohemian.

etymonline

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hobo (n.)

"a tramp," 1889, Western U.S., of unknown origin. Barnhart compares early 19c. English dialectal hawbuck "lout, clumsy fellow, country bumpkin." Or possibly from ho, boy, a workers' call on late 19c. western U.S. railroads. Facetious formation hobohemia, "community or life of hobos," is from 1923 (see bohemian).