For the most part Canon's naming convention is pretty logical:
#D = Full frame and professional level bodies, 1D, 5D, 6D, 7D with variations given a MK## 7DMkII
accepting 6D is not seen by some as pro, and the 7D is their pro APSC body
##D = Prosumer cameras 60D, 70D, 80D... (I'm not sure what happens after 90 as they already have a 100D)
Now we come to the consumer/enthusiast bodies:
In MOST of the civilized world they continue the numbering pattern:
###D = e.g. 600D, 650D, 700D, 750D, 760D...
But in North America they are rebranded Rebels (I gather because of a marketing effort with Andre Agassi in 1990) which is fine, BUT then they went to (me) a confusing jumble of numbers and letters: Rebel T3, EOS Rebel T4i, EOS Rebel SL1,
While in Japan since 1993 they use the Kiss name with the jumble... Kiss Digital N, EOS Kiss X6i, EOS Kiss X7...
The numbering ###D system makes it easy to identify where a camera body lies in the progression but for the life of me I am confused by the naming systems in Japan and North America.
I understand that for marketing and warranty reasons they wanted to identify different sales regions, but why could they not have had the Rebel 650D and the Kiss 650D?
Is there a logical pattern to this convention and if so, can you explain it in simple terms please???