I think I would probably use two names that I loved but try to stick with something like the same number of letters or same number of syllables so they would have that connection or at least have nicknames that are the same number of syllables or letters. Like:
[name_f][/name_f][name_f]Juniper[/name_f] and [name_f]Indigo[/name_f]
[name_f][/name_f][name_f]Alice[/name_f] (Alba) and [name_f]Sonia[/name_f] (Sunny)
[name_f][/name_f][name_f]Aurelia[/name_f] and [name_f]Evangeline[/name_f]
[name_f][/name_f][name_f]Kendra[/name_f] and [name_f]Nora[/name_f]
[name_f][/name_f][name_f]Wren[/name_f] and [name_f]Scout[/name_f]
[name_f][/name_f][name_m]Vivendel[/name_m] and [name_f]Madelief[/name_f]
[name_f][/name_f][name_f]Hannelore[/name_f] (Nellie) and [name_f]Elsinore[/name_f] (Nora)
[name_f][/name_f][name_f]Scheherazade[/name_f] (Hera) and [name_f]Aurembiaix[/name_f] (Aura)
[name_f][/name_f]Ásdís and Eidyn
Some that might be not the most usable in real life:
[name_f][/name_f][name_f]Meadow[/name_f] and [name_f]Prairie[/name_f]
[name_f][/name_f][name_f]Chrysanthemum[/name_f] (Emmy) and [name_f]Hyacinth[/name_f] (Aya)
[name_f][/name_f][name_f]Aquinnah[/name_f] and [name_f]Acadia[/name_f]