Answer:
It would be Sara Croll.
Explanation:
Since the color has the same number of letters as either a first or last name, you can look for 4 letters, given that blue has 4 letters. That would bring you to Sara. You would then have to find her last name, which you can do by process of elimination. The word yellow has 6 letters, and so does Menkin. That means that Menkin cannot be her last name. The word red has 3 letters, and so does Liu. That leaves Croll. Hope this helps!