This might be useful for visitors to Barcelona- just put in the street name and it will give you a clue from where it derives. For example,. a friend of mine lives on the Rambla del Raval, of which it says:
‘Raval, Rambla del: An urban area created on the basis of the Pla Central del Raval de Ciutat Vella. It includes the streets of Sant Jeroni and La Cadena, which are integrated into the new area.’
Some more information and examples here.
