When I see companies do what you describe (on the front/landing page), it comes across as pretentious and desperate, and reeks to me like they're trying to build their business based more around their image than their service.
Givenchy, Guerlain, Gaultier...some of the top fashion houses in the world. Everybody mispronounces their names, but even they don't stoop to the level of patronizing customers by trying to correct this (on their home pages, at least)-- and this is an entire industry based around filling their clientele with self-doubt!
Apple, too, is another good one. They're all about image. They wouldn't do this.
Ubuntu also handles it well. I like their product. I don't know how the name is technically pronounced. If I cared, I could find out on their About page. But they don't try to beat me down with my own ignorance.
MAC (cosmetics, not Apple) might do something like this. But their image strikes me as having been built on overpriced goods and condescending service, so something like this would fit their theme.
In my opinion, if the first thing you feel you have to present to me is a justification of your choice of name, you might reconsider operating under an intelligible moniker or at least letting me draw my own conclusions about how to pronounce it so my first opinion of your business isn't negative.
I know it's the "cool" thing to do right now, which is why you're asking about it, but it's pedantic and unprofessional. You offer a service, right? Sell me that, not your idea of how I should perceive your company.