When Waze gives navigation Guidelines to "turn", "exit", or "preserve" onto an unnamed section, it's going to seem forward to the encouraged route for just a road name that it can use. When there is a named phase further together the proposed route, it will eventually use (inherit) that name https://kingswoodhomes.uk.com/news/blackburn-pupil-wins-competition-to-name-a-street-at-green-hills/