Name stealing?!

Mikell

So my sister had always loved the name Aurora since forever. She was gonna name her daughter that name. She just had a girl in November and decided to name her Wren instead. I met my now husband in September and obviously before Wren was born my husband asked me if I liked the name Aurora before ever knowing my sister had liked it. I told him there was a big chance she was gonna name her daughter Aurora, big surprise she didnt and named her Wren. Well, now we are pregnant with a little girl and my husband wants to name her Aurora. My sister is saying I'm stealing her name. I dont see how its stealing since she had the chance to name her Aurora and didnt. And what I hear arent going to have anymore kids. My husband liked the name before he knew me so how is my husband stealing a name he liked before?