What does the eight-character happy Shui Mu mean?

The eight characters like water and wood, which means that water and wood are beneficial to this person in the five elements.

Then you should add five elements to your name, that is, Shui Mu's words or meanings. If you need wood more, you can use two trees. You asked if you want to get two pieces of wood in the back. That's what you mean, but the name is not just about how to get two beneficial five elements. Name is a comprehensive measure, and the five elements are one side. You also need to consider pronunciation, meaning, feeling and so on.