Terry,
Sandy, and
Stacy.
Terry can derive from
Theresa /
Teresa (female), or
Terence (male).
Sandy can be a nickname for a blond person, in which case it's truly unisex, or as nn of
Sandra, in which case it's feminine.
Stacy /
Stacey can be a nickname for either
Eustace (male) or
Anastasia (female).
Sydney is just a "feminized" misspelling of
Sidney, an (originally) exclusively male name.
I've only heard of
Vinnie as a nn for
Vincent.
Hope this clears things up for you! :-)
Miranda