Partner loves the name [name_m]Jack[/name_m] (my grandfather’s name). We are using it for our boys middle name of our b/g twins. We do not like any of our family name options for our girls middle name. Is it wrong to give him a family middle name and her an original one? 
I don’t think that’s a problem at all. You need to go with names you like and would be happy giving your child. Of course, if there’s some sort of tradition or expectation that family names be used, that’s a different story…
Why don’t you share the family name options and maybe some of us can come up with some suggestions you may like? Maybe something inspired by the family name.
I don’t know far back you’ve looked, but also consider family last names that work as first names too.
That being said, I think it would be just find to give her and original name and her brother the family name.
I think it’s ok. One of my sisters had a family middle name, and the other 2 of us did not. It was never a problem for us…although my mother says she regretted not giving us all family names.
If it’s a problem, you could use [name_f]Jacqueline[/name_f] or [name_f]Jacquetta[/name_f].
I am the oldest of four and all my siblings were named after family members except me. It’s not a huge deal, but I have always wished that I was named after someone as well. I used to feel left out lol.
Have you tried looking at international versions of some family members’ names? For instance, my grandmother’s name was [name_f]Helen[/name_f]. I don’t find the name [name_f]Helen[/name_f] pretty at all, but I adore [name_f]Elena[/name_f], which is the Spanish version. Best of both words! I’m still honoring my grandmother, but I’m using a name I adore.