You’ve already got a solid list but I’ll suggest a few others. Of the ones you listed, I would pair [name_f]Theodora[/name_f] or [name_f]Chiara[/name_f] / [name_m]Reuben[/name_m] or [name_m]Jasper[/name_m] with the girls’ names!
[name_f][/name_f]Not sure if you want to stick with 3 syllables but here are my suggestions!
[name_f][/name_f]Boys:
[name_f][/name_f][name_m]Carlisle[/name_m]
[name_f][/name_f][name_m]Halloran[/name_m]
[name_f][/name_f][name_m]Ivan[/name_m]
[name_f][/name_f][name_m]Tristan[/name_m]
[name_f][/name_f][name_m]Osric[/name_m]
[name_f][/name_f][name_m]Whittaker[/name_m]
[name_f][/name_f][name_m]Duncan[/name_m]
[name_f][/name_f][name_m]Jeremiah[/name_m]
[name_f][/name_f][name_m]Evander[/name_m]
Girls
[name_f][/name_f][name_f]Bettina[/name_f]
[name_f][/name_f][name_f]Vera[/name_f]
[name_f][/name_f][name_f]Suzette[/name_f]
[name_f][/name_f][name_f]Aretha[/name_f]
[name_f][/name_f][name_f]Georgianna[/name_f]
[name_f][/name_f][name_f]Ambrosia[/name_f]