Is [name_f]Callie[/name_f] her full name? If not, “Callie, short for _____”.
[name_f][/name_f][name_m]Or[/name_m] maybe, [name_f]Callie[/name_f] with C, [name_f]Callie[/name_f] like [name_f]Calypso[/name_f], [name_f]Callie[/name_f] like [name_f]Calliope[/name_f] or [name_f]Callie[/name_f] similar to [name_f]Allie[/name_f].