I really like:
[name_f][/name_f][name_f]Cleo[/name_f] [name_f]Francesca[/name_f] → elegant and bright but friendly too
[name_f][/name_f][name_f]Cleo[/name_f] [name_f]Marceline[/name_f] → fresh and sleek
[name_f][/name_f][name_f]Cleo[/name_f] [name_f]Fern[/name_f] → warm and sweet but sparky
[name_f][/name_f]Some suggestions:
[name_f][/name_f][name_f]Cleo[/name_f] [name_f]Matilda[/name_f]
[name_f][/name_f][name_f]Cleo[/name_f] [name_f]Felicity[/name_f]
[name_f][/name_f][name_f]Cleo[/name_f] [name_f]Penelope[/name_f]
[name_f][/name_f][name_f]Cleo[/name_f] [name_f]Delphine[/name_f]
[name_f][/name_f][name_f]Cleo[/name_f] [name_f]Eliza[/name_f]
[name_f][/name_f][name_f]Cleo[/name_f] [name_f]Pearl[/name_f]
[name_f][/name_f][name_f]Cleo[/name_f] [name_f]Ottilie[/name_f]