Source : Webster's Revised Unabridged Dictionary (1913)

Soho \So*ho"\, interj.
   Ho; -- a word used in calling from a distant place; a
   sportsman's halloo. --Shak.

Source : WordNet®

SoHo
     n 1: a district in southwestern Manhattan noted for its shops and
          restaurants and galleries and artist's lofts
     2: a city district of central London now noted for restaurants
        and nightclubs

Source : Free On-Line Dictionary of Computing

SoHo
     
        {small-office/home-office.}