Lillys Lane in the Central City, Christchurch

Lillys Lane in Central City. Nothing on the library website and I suspect that it isn’t an official lane. The street sign also didn’t look like an official street sign. I didn’t walk down it as it just seemed to lead to the back of a hotel on Montreal St but the sign was on Peterborough St. It is often these little right of ways that become public streets after many years of use. This is unlikely to happen for this lane while it leads to a hotel but if the usage of the land changed and it became residential then it could become an official street. I want to know who is Lilly and is it legal to have a sign like this.