If this has been posted up before I apologise now but several searches turned up loads of threads containing the words!
Where does the term "Spider" originate?
Apparently it is a distant association with a light horse-drawn carriage which looked vaguely arachnid thanks to its spindly construction and many-legged folding roof.
So now you know.
The original round-tail was knicknamed "osso di sepia" in Italy meaning "Cuttlefish Bone" as all Budgie fanciers know looks a bit like the rear end shape.
I also read that the initial public response to naming it yielded 100,000 responses in two months ( no internet then so

) which included:
"Alfa Acapulco", "Al Capone" (is that where "Acapulco Al" took his name???), "Edelweiss"

, Lollobrigida, Pizza, Shakespeare and Stalin.
Acknowledgement to an old issue of Practical Classics in my desk!