Coincidence?

My name is Shane Collette. The girl that I sit next to in ACH's name is Colette. In class Baldwin kept calling her Shannon. Shannon is my sister's name. He was calling Colette Shannon when I have a sister named Shannon Collette. I thought it was a strange coincidence. I then decided that Colette and I should not get married because then her name would be Colette Collette and that would just not be normal.