Magnus and
Ingrid would make great siblings in a family of Scandinavian descent!
Magnus might be a little much, though, if you're not Scottish or Norwegian ;)
Ingrid is stunning, and I think in serious contention if we have another little girl. The hard g-, r- and -d would put some people off.
Agnes and
Agatha are both usable, and
Aggie is a sweet nn, though I think many people would find these too old-fashioned.
Agatha might work better because it end in a like many current girls' names.
Agnes is prettier in French :)
Gilbert- my daughter's name is Anne...but if it weren't, I'd totally try to talk my partner into
Gilbert nn
Gil or
Gib for a son!