Well, here down under most side streets/alleys would only get a name if they were important enough....
and that depends on whether or not there are postal addresses located on them...
otherwise, with no postal addresses, it depends on the town planner at the time....
things vary greatly all the time, and vary greatly from city-city, and suburb-suburb within the same city.... so do what you want...
one common thing here though, is that when a street has a back passage running parallel to it, like a back entrance to houses etc., but no new postal addresses, then the street is labelled as SOMETHING Lane (Ln)
eg.
address: 14 Smith Avenue/Street etc. ... may have a back driveway or garage backing onto Smith Ln
