I have heard that the Lazy Susan food storage cabinet was named in
honor of one of Thomas Jefferson's daughters.  Could you please
confirm or deny this?

This may be interesting:
http://www.jewishworldreview.com/0603/dictionary_men061703.asp

Scriptor

It seems like it could not be true, as Jefferson had no daughter named Susan:

http://www.americanpresident.org/history/thomasjefferson/

(and the daughter of a slave was named Sally).

Myoarin

A bit of Google searching and I find results that say it is named
after a daughter of Thomas <i>Edison</i> as opposed to Jefferson,
being a creation of his.  I can't verify that that isn't just legend,
though.

At the bottom of this site you will find the Edison also did not have
a daughter named Susan:

http://www.kids.net.au/encyclopedia-wiki/th/Thomas_Edison

Data confirmed on another site, in case you also distrust a site for
kids that states that Edison's "greatest invention" was the Menlo Park
Lab.

Confirming myoarin's findings:  

"Timeline of Jefferson's Life"
Monticello
http://www.monticello.org/jefferson/timeline.html

"Timeline for Inventing Entertainment: The Motion Pictures and Sound
Recordings of the Edison Companies"
The Library of Congress -- American Memory
http://memory.loc.gov/ammem/edhtml/edtime.html

Thus, there was no daughter Susan for Jefferson or Edison, unless a
daughter had that nickname, or a Susan was born out of wedlock.

Thanks, Scott.
Just had another thought:  "black-eyed-susan", a daisy-like flower.
Could the namer of the item have considered that a turntable with
plates around the edge and the condiments in the middle resembled such
a flower?
Pure speculation on my part.
Myoarin