In WPF, what are the differences between the x:Name and Name attributes?

Question

The title says it all. Sometimes it seems that the Name and x:Name attributes are interchangeable.

So, what are the definitive differences

Answer 1

One of the answers is that x:name is to be used inside different program languages such as c# and name is to be used for the framework. Honestly that is what it sounds like to me.