Lisa? Oh no you mean Andrea!

We were waiting in line to get into a crowded Manhattan breakfast spot and were chatting about middle school.  Joe knows the band teacher at the middle school Andrea, my sister in law, went to and had asked if the guy remembered Andrea who played the flute in the first chair.  The guy didn't remember and Joe thought it was a bit strange so he asked Andrea and she said, "Oh no, he will know me by Lisa.  I changed my name in college because there were two other girls on my floor with the same name."  

We don't get it either.  Just another quirky in-law story.