Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
ipad
ipad 2
new ipad
ipad (was retroactively called the ipad 4)
ipad air
ipad air 2

I Don't see much rhyme or reason in ipad naming

That's too bad. I very much like consistency and a pattern to things and it doesn't exist with the iPad naming
 
iPad: 1
iPad 2: 2
The New iPad (also called iPad With Retina Display and iPad 3rd Generation): 3
iPad With Retina Display (also called iPad 4th Generation): 4
iPad Air: 5
iPad Air 2: 6
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.