The name Gizzy has no documented meaning in the sources checked.
Playful
Cute
Gold, Brown, White, Black
Small
Unisex
English
G
5 Letters
A Chinese surname (薄奚), also a disambiguation page
Recorded as a given name in Popular Culture (masculine) and Pashto (feminine)
A playful and fun character
A former commune in the Yonne department in France
Diminutive of Dieter