Ooh, I love [name_m]Cosmo[/name_m]! Some ideas …
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Cleo/Clio (maybe a bit matchy with [name_m]Cosmo[/name_m])
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[name_f]Cerise[/name_f]
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[name_f]Dove[/name_f]
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Faye/Fable
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[name_f]Flora[/name_f]
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[name_m]Hero[/name_m]
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Ione/Iona
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[name_f]Iris[/name_f]
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[name_f]Luna[/name_f] (also maybe a bit matchy)
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[name_f]Pearl[/name_f]
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[name_f]Primrose[/name_f]
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Sable/Sybil
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[name_f]Zosia[/name_f]
Good luck! [name_f]Hope[/name_f] something sparks joy!