"SoFlo” is “South Florida.” The name, perhaps, was influenced by the trendy 1960s abbreviation for “South of Houston” in New York City, “Soho,” that has influenced many New York City neighborhood abbreviations.

The “SoFlo” term has been used from at least 1993.


How to Talk American
by Jim Crotty
Boston: Houghton Mifflin Company
1997
Pg. 120:
SoFlo: South Florida. Aka “Baja New York.”

Google Groups: comp.multimedia
IICS SoFlo Meeting
From:  CHAZ IICS
Date:  Mon, Dec 19 1994 8:36 pm

The first meeting of the south Florida Chapter of the International
Interactive Communications Society will be held on Tuesday, January 24,
1995 at 7:30 P.M. at Venture Productions, 16505 NW 13th Avenue, Miami,
Florida.

(Trademark)
Word Mark SOFLO
Goods and Services (ABANDONED) IC 016. US 038. G & S: printed material; namely, stickers, paper banners, and paper pennants
(ABANDONED) IC 025. US 039. G & S: clothing; namely, T-shirts, sweatshirts, sweatpants, jackets, shirts, socks, shorts, undergarments and shoes
Mark Drawing Code (1) TYPED DRAWING
Design Search Code
Serial Number 74435260
Filing Date September 14, 1993
Current Filing Basis 1B
Original Filing Basis 1B
Published for Opposition March 29, 1994
Owner (APPLICANT) Gallen, Christopher INDIVIDUAL UNITED STATES 11855 Skylake Place Tampa FLORIDA 33617
Type of Mark TRADEMARK
Register PRINCIPAL
Live/Dead Indicator DEAD
Abandonment Date December 22, 1994