US [name_m]East[/name_m] [name_m]Coast[/name_m] here– I definitely hear [name_f]Penelope[/name_f] more and it is also in the top 30 USA names from last year. Conversely, [name_f]Eloise[/name_f] is still in the top 75 but is several spots removed from [name_f]Penelope[/name_f].
[name_f][/name_f]Based on both of those, [name_f]Eloise[/name_f] [name_f]Diana[/name_f] would be the choice though I think [name_f]Diana[/name_f] [name_f]Eloise[/name_f] flows better.