Are these parents illiterate? Did they not go to school? Using a different spelling only makes a name unique in writing; other than that, it's still the same thing.
My parents are neither illiterate nor uneducated. This is my sister's name and I think it's beautiful and interesting in both sound and spelling, and it fits her perfectly. Just because people spell a name in a way other than the traditional way doesn't mean they are stupid. If a name doesn't fit your personal taste, fine. But the tone of your comment is unnecessary.