Final answer:
The situation where you need to remember a person's name from all the names you have ever heard is called the tip-of-the-tongue phenomenon.
Step-by-step explanation:
The situation where you need to remember a person's name from all the names you have ever heard is best called the tip-of-the-tongue phenomenon. It is a memory error known as blocking where the memory is right there, but you can't seem to recall it. For example, not being able to remember the name of the actor Morgan Freeman.