Is it really not a big deal?

Brother in law and his wife want to name their baby after my husband when we had already picked out the name for our baby boy. This is the second time they take a baby name from us. However the first time I did not mind because it was just a baby name but this time it is after my husband. They are taking the full name, exactly like my husbands name! I refuse to have my child being called “ the second “ because they just can’t pick another name! ( i told them, I’m still naming my baby after my husband and they said it was ok that they can call him “ the second “ ) 🙄