[name]Sage[/name] (first thing I thought of, super cute and sweet)
Sarabeth (first name that came to mind when I thought of [name]Sebastian[/name])
[name]Susan[/name]/[name]Susie[/name]
[name]Sierra[/name]
[name]Serafina[/name]/[name]Seraphina[/name]/[name]Sera[/name]
[name]Siobhan[/name] (pronounced shiv-vaughn)
[name]Skye[/name]
[name]Sophie[/name]/[name]Sophia[/name]
[name]Sonia[/name]
[name]Sandra[/name]
[name]Sasha[/name]
but top 3 suggests though that fit with your style (in my opinion) and your daughters name would be
[name]Filippa[/name] and … [name]Serafina[/name]
[name]Filippa[/name] and … [name]Siobhan[/name]
[name]Filippa[/name] and … [name]Sierra[/name]
[name]Filippa[/name] and [name]Stella[/name] (great together [name]IMO[/name])
[name]Filippa[/name] and [name]Savannah[/name]
[name]Filippa[/name] and [name]Seraphine[/name]
[name]Filippa[/name] and [name]Sibel[/name]
[name]Filippa[/name] and Safina