My muscle memory often confuses a and e with one another, even when I actively think about which letter I mean to press (as accidentally demonstrated one time when I was talking about how I liked the sax in music), and I sometimes confuse the verb suffixes of -d and -s, like I just did with "suffixes", even though suffix isn't a verb. Plural nouns aren't safe, and I think that's also true of just normal words that end in s. Come to think of it, I mess up a lot with suffixes, like typing a d at the end of a noun that happens to end with e. It makes no sensed but I do it.
And then there's two-letter words/abbreviations and accidentally typing them so fast that I type the second letter before the first one.
Also, typing a semicolon when it;s supposed to be an apostrophe.
On the subject of pronunciation, when I was little, I would sometimes get ready to say "this", or "that", but couldn't decide which because I was thinking (i.e. changing my mind) faster than I could keep up with, and this one second of constant switching would result in me saying "thit". Not sure if I ever said "thit's".
ffffff why can i never be concise
EDIT:
Very glad that my own is only 5 letters long.
Mine's three!
On the opposite end of the spectrum, mine's 15 and I spell it just fine. Then again, it's two words and I always hyphenate them, which kinda molds onto the first letter of the second last name. It usually ends up looking less like a hyphen and more like I just wrote a fancy-ish W (even when I'm just writing the initials).