@BBRV
Out of interest, why would you like the Atari name? MorphOS has always been similar to AmigaOS (and will stay pretty much compatible with it through the ABox), but it doesn't have any similarity with Atari. IMO "Pegasos" is a good name anyway.
Besides, most of your users will probably believe that Atari lost the Amiga/Atari wars. And even if you say that "Atari is coming back to beat Amiga" it won't make much sense as many MorphOS users would consider themselved "Amigans" :-D