Name problem

Ok my husband's biological father has 3 girls. I have only ever met one in 9 years. He doesn't have/want a relationship with his dad. Therefore we don't go around any of them. The sister that I did meet 7 years ago has two girls named Macy and Emily. 2 names we had picked out. The other 2 sisters, one has boys, don't know their names, and the other has kids but don't know if they are boys or girls let alone their names.

So would it be bad to put Macy and Emily on our list?