Originally Posted by JSWolf
John or john = toilet
Jon = person
jon = misspelling of Jon
Now as for the English language, it changes and evolves. So who's to say that eBook won't be the word? Heck, lol is now in the dictionary.
A toilet may be called "john", but never "John". You can call it an "eBook" if you wish, but there's very little change that becomes standard. Capitals get dropped from everything but proper nouns. Aspirin becomes aspirin. It takes teams of lawyers sending letters to keep Xerox and Kleenex from becoming xerox and kleenex. If iPad ever became a generic term for a tablet, given how the English language changes, it would probably change to ipad.
And John and Jon have different derivations.