When I was small I knew a girl who was called Ruth Funnel. Isn't that the best name ever?
We have plastic (UK made, by the way) ones in two sizes: The cone-y bit has a diameter of 14cm and the spout will fit into the neck of a wine bottle. Then there's an 8cm diameter one, for smaller funnelling.
And we also have a mini metal one. 5cm diameter and 5cm high. For really small funnelling.