I never worried about telling anyone my names because I was using them regardless. When I was about 25 weeks pregnant with the twins I met a woman who is now a good friend. We were chatting for ages then she introduced her daughter Scarlett. I froze for a minute then blurted out "If I'm having a girl she will be Scarlett too!". This was a small village, 900 people only, so 2 Scarletts was a bit strange but in then end they were just known as Big Scarlett and Little Scarlett and it was never a problem.