Not sure whether you envisaged us doing all boy-girl pairs or matching the choices to our own children. I've got 3 daughters so I'm picking girls' names:
European - Cassandra, Giovanna and Elisaveta
Posh - Araminta, Arabella and Alexandria
Grandparents - Daphne, Edith and Mary
Royal - Victoria, Matilda and Catherine
Nature - Raine, Robin and Star
Traditional - Charlotte, Isabel and Rebecca
Hippy - Saffron, Rainbow and Lyric
Hipster - Astrid, Cleo and Ivy
Literature - Aphra, Sylvia and Maya
Animal - Robin, Jay and Wren
Plant - Strawberry, Cherry and Apple
Scientific - Rosalind, Harriet and Sophie
Biblical - Naomi, Miriam and Abigail
Films - Amelie, Coraline and Iris
Flowers - Jasmine, Violet and Tigerlily
Unusual - Aubrey, Christabel and Mala
Classical Gods - Athena, Artemis and Persephone
Actors - Natalie, Keira and Emma
Matching Letters - Avery, Amberley and Anika
Beachy - Ocean, Skye and Summer
Musical - Lyric, Harmony and Melody
Musical Theatre - Elphaba, Ariel and Eponine
Dance - Anna, Darcey and Margot
Virtue - Faith, Grace and Felicity
One Generation Out - Hayley, Kirsty and Nicole
Hyphenated - India-Rose, Miranda-Kate, Amy-Grace