[m0nty]

> Thus, we usually have to write the name of the oil company as "Exxon", though its proper spelling is "e exx o n". (Don't make the mistake of pronouncing "Exxon" like "exon"; you will appear unsophisticated.)

The development of the Exxon exx is shown here:

http://www.logodesignlove.com/exxon-logo-raymond-loewy

It's clearly a double-x rather than any more exotic character, the styling is just that - styling.

The Wikipedia article has it as /ˈɛksɒn/ and that's the pronunciation used in their commercials:

https://www.youtube.com/watch?v=_s80Hbac2b8

So that's way off-topic. But what he says about "dox" vs. "doxx" is as much a preference as "focused" and "focussed", or "busing" and "bussing" - there's no "correct" way, not even if it is the original way.

[harryjo]

The additonal 'x' was added cosmetically, to disambiguate form (a person named) "Exon"

https://en.wikipedia.org/wiki/Exxon#History

There's no particular reason to believe they wanted to change the pronunciation as well.

[tedks]

>The development of the Exxon exx is shown here:

woosh