At this point, Google should just launch the Pixel 4a with the Pixel 5
(Android Central)

Eventually you have to just change the name of the phone to Pixel 5a, right? Where`s the Google Pixel 4a? Your guess is as good as anyone`s at this point. We don`t know why Google hasn`t announced it yet, but it`s a pretty badly-kept secret that the Pixel 4a is effectively done, and it`s close to launching — though it`s been close for months now. And at this point, Google needs to consider just putting the brakes on it altogether and launching it as a Pixel 5a alongside the Pixel 5. If we remember back to last year, the Pixel 3a was launched on May 7 during Google I/O — and even that was a significant delay from what we initially expected. Now we`re a full 14 months removed from the Pixel 3a, and there`s nothing more than a glimmer of expectation that the Pixel 4a will launch imminently. Previous leaked launch dates pointed to May and June releases, which came and went without a peep, and the latest information still points to mid-July ... though after these delays, you can`t...