You already know how to do this, you just don't realize it.
How do you find files with an "x" in their name?
That's right, you use
Now you just have to change that x to a space. And since spaces are command line delimiters, you need to quote the sequence so it gets treated as a single parameter rather than two "*" parameters:
dir "* *"
Stick in a
/s if you want to search recursively.