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Althea is also used in a poem called "To Althea, From Prison" by the poet Richard Lovelace. It's one of two of his poems to have women's names in the titles. He's best known for "To Lucasta, Going to the Wars."
Meghan is bound to choose something unconventional. No Louises and Beatrices for her! Children far from the crown have names like Savannah and Isla. I could see her doing something like that, with either Elizabeth or Diana as middle name, though not both as that would be copying Charlotte Elizabeth Diana.
I have a cousin named Miah Isabel Andes Hardy (all her siblings are named after mountains) and I've met a Zoe Olivie Emerson.
Ariadne and Lizette sounds elegant to me while Astrid and Calypso have a spunky, hero feel. Arwen is a Lord of the Rings character so you probably don't want that.