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From your list, I think these are closest to the feeling of Imogen:
Celine
Ophelia
Eloise

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From other comments:
Isolde
Elowen
Cressida
Sibyl
Orla
Tamsin
Hazel
Phoebe

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My own additions (sorry if there are repeats that I missed in the comments!):
Eugenia
Florence or Flora
Maeve
Nola
Isobel (unless it's too close to Isabelle for your liking)
Iona
Rhea
Romilly

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“Fairy tales are more than true; not because they tell us that dragons exist, but because they tell us that dragons can be beaten.”
― Neil Gaiman