What is the origin of the word Botticelli?

"Botticello" means "little barrel" in Italian.

Alessandro di Mariano Filipepi(now known as Sandro Botticelli) modified his brother's nickname "Botticello"(presumably called that because he was big) to create the name he is known by today.

So...Botticelli doesn't mean anything.

It is derived from "Botticello", which means "little barrel"