There are two common spellings for my last name. So I spell it out of habit.
My surname is one letter-swap away from a much much more common surname. I have become resigned to the fact that everyone gets it wrong. Sometimes even when I sign my emails with my full name, people reply back and use the wrong name.
Evil person that I am, I gave two of my kids names that they will have to spell for their entire lives. Mwahahahahaaaa. The other two got normal names.
My brother lucked out with “William”. My sister got “Marian”, which everyone misspelled as “Marion”.
I constantly have to spell both my first and last names - my first name isn’t common, but I think of the four ways I’ve seen it spelled, mine is the most common. People almost always spell my last name wrong the first time - sometimes they spell it like the famous person who spells it one letter differently. Other times they don’t hear the “t” in the middle of the three consonants and at pizzerias they turn (fake name) “Forstner” into “Forsta” because I guess that’s how it sounds to Italians. And my family actually uses an incorrect speling which should make it easier. Thank God I never need to use my middle name- because that, too, has multiple spellings.
Even my middle name is beyond some people. It’s a family surname on my mother’s side and nobody hears it correctly. I stuck my oldest with the same middle name.
The guy in the John Wayne movie, Chisum, (who was real) probably got tired of telling people his name was Chisholm, pronounced Chisum, and just changed the spelling.
Theres no way to misspell or mispronounce my first or last name.
Waves at Jane Doe.
Nope. It could be Jayne Dow.
There are 3 common variations of spelling for my first name. And then there’s the strange version my dad came up with that appears to be almost unique. Thanks for that! 53 years of having to spell my name and have people tell me they’ve never seen that spelling before.
When it doesn’t really matter, like Starbucks, I just say Dave, which is a version of my middle name anyway.
Both first and last name relatively common and easy to spell. But I just wanted to mention a Russian mathematician whose name has been transcribed into roman alphabet 23 diffferent ways. This is partly because it has been done by French, German, and English speakers according to rules or guesses.
Chebychef proved it; you can too. There’s a always a prime 'tween n and n times two. (True theorem, although you probably can’t prove it.)
The trend for youneekue and speshul baby naming these days won’t help. Very few are going to believe her parents went with something straightforward instead of something like Myquenzeigh that looks like a Scrabble set threw up.
I’ve been known to use my senior cat’s name in such situations. Allie could easily be a human female name and most people find it easier to spell/pronounce than my own first name. The cat doesn’t care. 
As for @griffin1977’s experience with people misspelling his name replying to emails he sent them, I used to have a supervisor who NEVER got it right. She seemed determined that my first name has 2 Ns. Of course, in her case, the constant cloud of pot smoke around her really didn’t improve her functioning.
That was a popular name some years ago, and then there was the “y” craze. I actually remember seeing someone’s daughter named Mykynzy.
I’ve seen a Justyn and wynston.
Why?
There’s only one correct way to spell my first name (Hebrew is much less flexible with spelling, especially with biblical names), but people always misspell it anyway. I tend to look over their shoulder when they’re writing and 8 times out of 10 I’ll say “There’s no vav after the shin.”
As for my last name, it’s relatively uncommon and very similar to two much more common names, so I have to spell it out so often that I’ve started to think of the spelling out as part of my name, as in, “Hi! My name is Firstname Lastname L-A-S-T-N-A-M-E! Pleased to meet you!”
My first name is somewhat uncommon, but swap two adjacent letters and it becomes a very common women’s name (I’m a man). So, often, when I’m in a waiting room and somebody who hasn’t met me comes out looking at a form and thinking they’re calling my name, they call the women’s name instead. We figure it out, including in-depth spelling analysis, but then they are plunged into hyperapologetic mode, as if misidentifying a man as a woman is a terrible insult. It’s not – most of my best friends are women – I should be so honored!
My first name is Marita. It throws people left and right. Martha. Marta. Maria. Marietta. Marica. Maricha is a very popular guess. Margarita. Mary. Rita. I have forgotten other wrong names. It’s phonetic for Pete’s sake.
I had hoped Marita Covarrubias on The X-Files would make it more familiar. That would be a no.
My last name is long, unusual, and German. Unless you’re German or Dutch or grew up in that German part of Texas you’re going to mangle it.
My older niece is Mikaylah. I’ve seen many different spellings of that name but not that particular one ever and no one ever gets her name right. McKayla, Mikayla, Michaela, MyKayla, Makayla, you name it.
My first name is fairly common with some other popular enough spellings that I usually just spell it out for people. No one ever assumes I have the “common” spelling.
My first name is somewhat uncommon. But the problem is pronunciation. It’s just one syllable but it’s pronounced very differently depending on where someone is from (Boston versus Savannah for instance). My last name is pretty common and also just one syllable but has four different spellings. So anytime someone needs to write my name down, I automatically say First f-i-r-s-t Last l-a-s-t. It’s just easier that way.