Willy Willy is

1. The term Willy-Willy is a local name used in Australia. 2. It refers specifically to a tropical cyclone that occurs in the region of north-west Australia. 3. Tropical cyclones are known by different names in different parts of the world (e.g., hurricanes in the Atlantic, typhoons in the West Pacific). 4. Option (A) is incorrect; it's not a type of tree. 5. Option (B) is incorrect; while it's a wind phenomenon, it's specifically a cyclone, not just any desert wind. 6. Option (D) is incorrect; it has no relation to fish near Lakshadweep.