How to name a HashMap in Java?

Question

This might be a silly question, but I have never found a satisfying way to name a variable of type HashMap in Java. For example - lets say I have a

Answer 1

I don't believe there is a hard-written rule anywhere that tells you how to name your map, so as long as you come up with a rule that makes sense to you (and your teammates), then it should be fine.

Personally, I like to call my maps keyToValue or valueByKey.