I think the names are fine together and really, unless they were really off or weird sounding as sibsets, I think you should choose names that you love and be less stressed about how they sound with sibling names. I think you should go with your favourites and good luck!
I prefer [name_f]Zoe[/name_f] [name_f]Isabel[/name_f]… I really love [name_m]Isaac[/name_m] [name_u]James[/name_u] also… I think if you love these names then use them… that’s what matters in the long run:) good luck with your new little girl or guy!
The names you have chosen work so well with your last name and that is what is so important. [name_m]Isaac[/name_m] [name_u]James[/name_u] is great and I like both [name_f]Zoe[/name_f] [name_f]Claire[/name_f]/[name_f]Isabel[/name_f] but I slightly prefer [name_f]Zoe[/name_f] [name_f]Claire[/name_f] because it is shorter and sleeker with your last name.
[name_f]Zoe[/name_f] is a very pretty name! I feel like it definitely goes well with the other names you have chosen, and I think [name_f]Zoe[/name_f] [name_f]Claire[/name_f] would be lovely with your last name. [name_m]Isaac[/name_m] [name_u]James[/name_u] is a classic and great name, too! Your choices are wonderful.