In the Mac line, the iMac is the odd product out because it shares a prefix with the non-Mac lineup, i.e. the iPhone, iPod and iPad. While I find the name iPad Air to be horribly unnecessary — what comes next, iPad Pro? — for what could just be considered a thinner generation of iPad, I enjoy the notion of the Mac lineup having a full coherence of product names. Compare: iMac, Mac Pro, Mac mini, MacBook Pro, MacBook Air v.s. Mac Air, Mac Pro, Mac mini, MacBook Pro, MacBook Air The issue is always product recognition and an established brand name as with e.g. iTunes. However, the public wasn't decimated by the discontinuation of the eMac, or the iBook, and so on. A product called the Mac Air would have recognition value because of the modifier Air, which would identify it as "a thin, lightweight Mac". Of course, with the exponential march of technology, we may soon have nothing but Mac nano.