I really love [name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_f]Audrey[/name_f]—three stately names that match without any sharing an ending.
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_u]Sloane[/name_u]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_u]Kennedy[/name_u]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_u]Avery[/name_u]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_u]Waverly[/name_u]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_u]Everly[/name_u]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_f]Laurel[/name_f]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_f]Adriana[/name_f]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and
[name_u]Evelyn[/name_u] nn [name_f]Evie[/name_f] (idk if this is too popular though)
[name_f]Phoebe[/name_f]
[name_f]Violet[/name_f]
[name_f]Claire[/name_f]
[name_f]Emmeline[/name_f] nn [name_f]Emme[/name_f]
[name_f]Ivy[/name_f]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_u]Brooke[/name_u]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_u]Avery[/name_u]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_u]Eden[/name_u]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_u]Wren[/name_u]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_f]Isobel[/name_f]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_u]Finley[/name_u]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_f]Imogen[/name_f]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_f]Willow[/name_f]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_u]Emery[/name_u]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_f]Adelaide[/name_f]
[name_u]Harper[/name_u], [name_u]Madison[/name_u] and [name_f]Scarlett[/name_f]
And I like these already suggested for you: [name_f]Brenna[/name_f], [name_u]Sydney[/name_u], [name_f]Tessa[/name_f], [name_u]Brooke[/name_u], [name_f]Keira[/name_f], [name_u]Tatum[/name_u], [name_u]Blair[/name_u], [name_u]Quinn[/name_u], [name_u]Bryn[/name_u], [name_u]Teagan[/name_u], [name_u]Wren[/name_u].
I think since your naming style is for surname names then I think it’s a good idea to stay with that. So names like [name_u]Kennedy[/name_u] and [name_u]Sloane[/name_u] are a great idea.