Name problem

Ko

So my husband and I are not finding out the gender. We have always agreed on a girl name boys name has been much harder. Last week we finally agreed on one. my sister in law whose not pregnant told my husband her baby names and told him he can't have them. Of course it's the one name we agree on. I know you can't call dibs on names but I'm hurt since we finally agreeed and it's been something hard for us. And now I feel like I can't use that name if this baby is a boy. Anyone else have this happen or help in what to do. I know not a big deal but still annoyed