[codfrantic]

The UK is the champion at this.

Hoover

Biro

Transit van

[NeedMoreTea]

Many, many more in the UK:

Cashpoint is probably the winner - I've never heard anyone use anything else. I don't even remember whose trade mark it once was.

Sellotape

Airfix for all model kits

JCB for all diggers

Tarmac

[Nux]

Let's not forget about "Sandwich" :-)