Created using English names BTN has deemed "rare," which are not variations on more common names (I've used one or two names which are variations on other rare names, though). Some of them are a tad ridiculous, but that's part of the fun.
DH:
DW:
DD:
DS:
DS/DD:
DD:
DS/DS:
DD:
DD/DS:
DD:
Girls:
Ambrosine,
Anemone,
Anima,
Berry,
Briar,
Britannia,
Celandine,
Charis,
Cyrilla,
Davinia,
Delight,
Diantha,
Flannery,
Indigo,
Kelda,
Kestrel,
Lark,
Leontyne,
Maris,
Nona,
Ocean,
Odetta,
Peony,
Philadelphia,
Phyllida,
Saffron,
Symphony,
Tallulah,
Ulyssa,
Viona
Boys:
Adair,
Amias,
Barclay,
Beauregard,
Cairo,
Christmas,
Connell,
Driscoll,
Everard,
Farran,
Hammond,
Joby,
Keir,
Kipling,
Laird,
Lake,
Maitland,
Napier,
Ormonde,
Oswin,
Placid,
Radcliff,
Roydon,
Rudyard,
Sacheverell,
Tennyson,
Winslow,
Whitaker