How I have dealt with the Echo name game:
The Echo downstairs in living room kept the name Alexa. The Tap needs no name, and the two Dots are both named Echo (I refuse the name anything Amazon!). One Dot is in family room near the living room, and what does it matter If I get Alexa and Dot confused once in a while; not a big deal. The Dot in the bedroom can hardly hear the name Echo from downstairs or vice versa. So, we all co-exist fairly well. One thing for certain; we talk a little quieter to the devices than we used to.
Well, I do, but my wife grew up in Brooklyn, so she can often trigger both Dots, and it gives me the chance to tell her again that she is not living in Brooklyn anymore, and that she is talking too loud!
If you change any names, just put a small post-it on top of each device with its name on it; that can help get adjusted to the new names.