The game refuses to allow you to use a name for MC that is shorter than three letters. But there are plenty of real names who are only 2 letters long.
https://clickbabynames.com/116903/short-2-letter-baby-names-for-boys-girls
Also, I like to use 1 letter only. because:
a. it is my favorite nickname
b. it lets me post my save with bug reports without doxing myself.
So could you please remove the requirement that names be 3+ letters long?