26^n is big (for n > 7) but also irrelevant. "Useful and readable" is a tiny fraction of that space.
Edited to add:
While there's obviously some correlation between small n and the usefulness and reasonableness of the name, my point was not primarily related to length - the parenthetical was added as an afterthought. I was simply pointing out that the overwhelming majority of sequences of letters are not going to be easy to use or remember.
Edited to add:
While there's obviously some correlation between small n and the usefulness and reasonableness of the name, my point was not primarily related to length - the parenthetical was added as an afterthought. I was simply pointing out that the overwhelming majority of sequences of letters are not going to be easy to use or remember.