Jon Jones Sons
Sep 18, 2014how do i know when to use jon and i, or jon and me? Dec 6, 2014from this, i would tentatively conclude that (1.) the vernacular pronunciation of the name became a single-syllable "jon" fairly early on, and (2.) the john spelling might have. I was taught, lo, many years ago, that you should use a comma before the name of the person (s) you address.
The main difference between lying and not using a comma in "thanks, john", in your analogy, is that lying is a deliberate act of deception that often has negative consequences for the person. Apr 12, 2017john doe is very generic, rolls off the tongue, and in colloquy is not easily mistaken for a known person, like "john smith" might be (there was at least one very famous john.