[name_u]Corbin[/name_u]?
[name_u]Callum[/name_u]?
[name_m]Lorcan[/name_m]?
[name_u]Calder[/name_u], [name_m]Calix[/name_m] and [name_m]Calvin[/name_m] are my first thought if they want to get the nn [name_u]Cal[/name_u]. Maybe even [name_m]Pascal[/name_m], with nn [name_u]Cal[/name_u]. I quite like the sounding of [name_f]Esme[/name_f] and [name_m]Pascal[/name_m]