In addition to the well-known and well-loved Disney character, "goofy" is also an adjective meaning silly. Goofiness is particularly characterized by cartoonish or exaggerated behavior. It can also mean bumbling behavior, as in a "goof-up".
Since I have discovered their wonderfully ridiculous website (www.kabalarians.com), I should probably tell you that according to Kabalarian philosophy, if your name is Goofy, you may have difficulty concentrating, and often get in trouble for speaking before you think. You are popular but restless and are easily distracted.