The Collaborative International Dictionary of English v.0.48:
Soho \So*ho"\, interj.
Ho; -- a word used in calling from a distant place; a
sportsman's halloo. --Shak.
[1913 Webster]
WordNet (r) 3.0 (2006):
SoHo
n 1: a district in southwestern Manhattan noted for its shops
and restaurants and galleries and artist's lofts [syn:
SoHo, South of Houston]
2: a city district of central London now noted for restaurants
and nightclubs
V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
SOHO
Small Office / Home Office [market]
The Free On-line Dictionary of Computing (30 December 2018):
SoHo
small-office/home-office.