From my list that haven’t been mentioned yet:
[name_f][/name_f][name_m]Adair[/name_m] (different enough from -er?)
[name_f][/name_f][name_f]Annabeth[/name_f]
[name_f][/name_f][name_f]Annaliese[/name_f]
[name_f][/name_f][name_m]Bo[/name_m]
[name_f][/name_f][name_f]Caro[/name_f]
[name_f][/name_f][name_f]Cecile[/name_f]
[name_f][/name_f][name_f]Coral[/name_f]
[name_f][/name_f][name_f]Ellen[/name_f]
[name_f][/name_f][name_m]Ellis[/name_m]
[name_f][/name_f][name_f]Elsbeth[/name_f]
[name_f][/name_f][name_f]Elspeth[/name_f]
[name_f][/name_f][name_f]Emmylou[/name_f]
[name_f][/name_f][name_f]Harriet[/name_f]
[name_f][/name_f][name_f]Imogene[/name_f]
[name_f][/name_f][name_f]Jane[/name_f]
[name_f][/name_f][name_f]Joelle[/name_f]
[name_f][/name_f][name_f]Joy[/name_f]
[name_f][/name_f][name_f]Lou[/name_f]
[name_f][/name_f][name_f]Maren[/name_f]
[name_f][/name_f][name_f]Marlow[/name_f]
[name_f][/name_f][name_f]Meg[/name_f]
[name_f][/name_f][name_f]Merryn[/name_f]
[name_f][/name_f][name_f]Miriam[/name_f]
[name_f][/name_f][name_f]Muriel[/name_f]
[name_f][/name_f][name_f]Nell[/name_f]
[name_f][/name_f][name_f]Opal[/name_f]
[name_f][/name_f][name_f]Pearl[/name_f]
[name_f][/name_f][name_f]Rosalind[/name_f]
[name_f][/name_f][name_m]Rowan[/name_m]
[name_f][/name_f][name_f]Ruth[/name_f]
[name_f][/name_f][name_f]Sybil[/name_f]