* It's a nickname: It could be a nickname for someone, perhaps a friend or family member.
* A fictional character: It might be a character from a specific book, TV show, or game that's not widely known.
* A local figure: There might be a local figure or personality in a specific community who is known by this name.
Could you provide more context? For example:
* Where did you hear this name?
* What kind of character are you expecting?
* Is there any other information about "Silly Solly Sandy" you can remember?
With more information, I might be able to help you figure out who "Silly Solly Sandy" is.