Changing Child's Middle Name

[PeterPeterson]

Bit of a long shot here but wondering if anyone has any advice before I go to a solicitor.
I have a DD who is 7, when she was born we registered her with her dads surname. Since then me and her dad split up, at the time of our separation I asked ex partner if we could double barrell DD's surname so that I would have some connection but he refused, I accepted this at the time.
I am now about to have another baby with a new partner, baby will have partners surname but my surname as a middle name and DD would like to do the same to match her sibling, ex partner has agreed to this now.
When I look at the forms required there is an affidavit that needs to be completed in the presence of a solicitor stating that this is in best interest of the child, but the options seem to be more related to surnames to me.
Does anyone have any experience of this?

I'm going to answer something you havent asked for opinions on. Sorry in advance

Are you married to your new partner? If not, do you maybe want to reconsider the surname you are using... incase history repeats itself?

I was going to say exactly what @BobbieDraper said.

So the kids surnames won't be the same? Just middle names?

I honestly wouldn't bother. It seems like such hassle for a name that is never used.
Aside from legal forms I've never used my middle name.
I understand wanting them to have a name in common, but unless it's surname it won't make any difference to anything.

I honestly wouldn't bother. It seems like such hassle for a name that is never used.
Aside from legal forms I've never used my middle name.
I understand wanting them to have a name in common, but unless it's surname it won't make any difference to anything.

You mention needing an affidavit. It seems you are tempted to go down the route of enrolment at court. This is time consuming, cumbersome, and entirely unnecessary.

If you are in England & Wales you need a simple change of name deed. Both parents sign. I’ll PM you.