Both names are right!
First this car was supposed to wear the name Bonero, but this name was already copyrighted by an Asian salesman who exported Benero scooters to Europe.
The name changed to "Benarrow" a compound of founder's name Benninghoven and Arrow.
Only three cars had already been produced in the UK. However the headquarter and sale of this small company is in Wittlich/Germany.
I will take Benarrow for the title as it never was sold under the Benero name.