But if I already know how to spell the name Sean, and then I hear Mar-sean Lynch on the radio or TV, then my assumption is that I already know how to spell it. I don't need to look it up when I type it here.
When the spelling police (which I appreciate here, actually) corrects me and says it's spelled like Shaun Alexander, I think, "well, that's new, but I suppose it makes more sense than pronouncing the initial 'S' as if it says 'Sh'." Ok, so Marshaun Lynch--there you go.
Nope. A more knowledgable person points out that it is actually Marshawn. Now I'm just frustrated, because this looks even better than Shaun. Why not, then, just spell it "Marshan" like where the name "Khan" is pronounced with a soft "a"?
Wait, someone else pipes up, Sean is just the Gaelic/Welsh form of the word John, which comes from the name Ian and is millennia old.
This is where I just give up. I'll spell it how I like and everyone else can just put up with it.
In truth, I try to get names right because a name is a person's identity. It reminds me of of the old Start Trek (TNG) episode where someone pronounces Data's name like the beginning of the word "platapus" instead of the rhyming with freighta. He says, "one is my name, and one is not."
Names matter.