I'd say this problem is pervasive, based on my experience. How many times have you seen code that does "for i:=0 to Count-1 do"? OK, maybe that's a stretch. Counter variables don't exactly require great names. But still, the point remains. Badly named variables, methods, components, etc. are very common. I find that when this happens in my code, it's due to a failure in my understanding of exactly what the code is meant to do. In the old days, you just had to change things around until they make sense. Today, it's called Refactoring.

My advice is that when you find yourself starting to have to do mental gymnastics to keep track of what a variable/method/etc. is used for, it's time to immediately change either the purpose or name of the variable (or both). It may be a minor inconvenience now, but it will pay major dividends the next time that code is looked at.