The tag wiki for mapview is currently this:
on Android OS, MapView allows you to create your own map-viewing Activity
The list of questions seem to go along with it, I didn't notice any non-Android questions while skimming over it. However, the term "mapview" is very broad. Even if it'snot widely misused, it should have it's Android prefix just for indication, since that's the only place it appears it can be used.
The tag android-mapview already exists, but with fewer questions. The existing ones should be merged into that tag. I'm on the fence about synonyms due to the vagueness of the unprefixed tag name.