What are you thoughts on the following combinations of names and spelling? The middle names are all linked to family members.
[name_f]Isobel[/name_f] [name_f]Florence[/name_f]
[name_f]Isobel[/name_f] [name_u]Marion[/name_u] / [name_f]Isabel[/name_f] [name_u]Marian[/name_u]
[name_f]Isabelle[/name_f] [name_f]Sabine[/name_f]
… or any variations of the above. I’d love other suggestions for similar names as well 
My top combo’s out of these names are:
[name_f]Isabelle[/name_f] [name_u]Marion[/name_u]
[name_f]Florence[/name_f] [name_u]Marion[/name_u]
But out of the combinations you provided, I think [name_f]Isabelle[/name_f] [name_f]Sabine[/name_f] goes very well together!
[name_f]Isabelle[/name_f] [name_f]Florence[/name_f] is gorgeous.
[name_f]Isobel[/name_f] [name_u]Marion[/name_u] and [name_f]Isobel[/name_f] [name_f]Florence[/name_f] are lovely. I like both [name_f]Isobel[/name_f] and [name_f]Isabel[/name_f] spellings, but just can’t get on board with [name_f]Isabelle[/name_f] which looks over the top to me (unless you’re [name_m]French[/name_m] or the surname is [name_m]French[/name_m] in which case it seems to match nicely). [name_f]Sabine[/name_f] is ok, I just prefer the vintage feel of the others. I also don’t mind the [name_u]Marian[/name_u] spelling - in which case I’d do as you have done and make it [name_f]Isabel[/name_f] [name_u]Marian[/name_u].
I like [name_f]Isobel[/name_f] and hate [name_f]Isabelle[/name_f].
[name_f]Isabelle[/name_f] is too common and boring. I hate how [name_f]Sabine[/name_f] looks.
[name_f]Florence[/name_f] [name_u]Marion[/name_u] [name_f]Sabine[/name_f]
I like [name_f]Isobel[/name_f] [name_f]Florence[/name_f] and [name_f]Isabelle[/name_f] [name_f]Sabine[/name_f]! Though I’m not sure about how the latter one flows, all are gorgeous names.
New[/name_m] [name_m]Roman[/name_m]] [name_m]Hi[/name_m]! I’m new here. [name_f]Isobel[/name_f] [name_u]Marion[/name_u] is soooo dreamy and by far my favourite from your list. Its absolutely beautiful. I much prefer the more understated [name_f]Isobel[/name_f] spelling rather than [name_f]Isabelle[/name_f], unless, like the other posters said, you’re [name_m]French[/name_m] or have a [name_m]French[/name_m] surname. Both are nice though. [name_f]Isobel[/name_f] [name_f]Florence[/name_f] is also nice, and I love both of names on their own but to me personally, the combination sounds a little bit overlong. [name_f]Isabelle[/name_f] [name_f]Sabine[/name_f] is also nice, and its lovely that you’ve incorporated family names, but [name_f]Isobel[/name_f] [name_u]Marion[/name_u] is still my absolute favourite. Gorgeous names!