Hmm, maybe:
[name_f][/name_f][name_m]Theodore[/name_m] (Theo, [name_m]Teddy[/name_m], Ted)
[name_f][/name_f][name_m]Alexander[/name_m] (Alex, Xander)
[name_f][/name_f][name_m]Harrison[/name_m] (Harry, Sonny)
[name_f][/name_f][name_m]Sebastian[/name_m] (Seb, Bash)
[name_f][/name_f][name_m]Felix[/name_m]
[name_f][/name_f][name_m]Tobias[/name_m] (Toby)
[name_f][/name_f][name_m]Atticus[/name_m]
[name_f][/name_f][name_m]Leo[/name_m]
[name_f][/name_f][name_m]Thaddeus[/name_m] (Tad)
[name_f][/name_f][name_m]Phineas[/name_m] (Phin)
[name_f][/name_f][name_m]Cassius[/name_m]