If you're looking for a Hindi word that might have a similar meaning or feeling to "Gigi," it depends on the context.
For example, if "Gigi" is being used as a nickname for someone named "Georgina," you could use a Hindi name like "Geeta" or "Gita" as a nickname.
If you're trying to find a word that describes the feeling or sentiment associated with "Gigi," you would need to provide more context.