[name]Arden[/name] or [name]Mabel[/name] [name]Rose[/name], with an edge to [name]Arden[/name].
[name]Rose[/name] is a good middle name for uncommon, two-syllable firsts. But I do agree that [name]Mabel[/name] might still benefit from something else
[name]Arden[/name] or [name]Mable[/name] [name]Rose[/name]. I slightly prefer [name]Mable[/name] in general over [name]Arden[/name]. [name]Both[/name] are lovely choices.