This doesn't make sense. How does Amiga Inc sueing Hyperion force AROS to change it's name?
The A in AROS used to stand for Amiga (acronym). If AInc. starts to sue for trademark, even if it is about an unrelated company, you´d better get out of the way if you can´t pay your lawyers to defend your name in court.
In fact if you go to morphos-team today, you will not find the name "Amiga" except for in "amigaguide.library"