thabo: I have not mentioned anything about Mekubalim in my comment.
I referred that not all Rabbonim will get involved with this.
I personally know too many cases of couples who have asked me to daven on their behalf for children, and I see that many have one name the same as their mother in law! On the same note, we had the same shaila in my family, we asked a Rav , who told us it was okay and we should check with 3 Rabbonim. We did , they all said it was okay , in this case. They are married Baruch Hashem with children.