I think that [name]Greta[/name] [name]Day[/name] sounds like a movie star! I personally love [name]Hana[/name], but do not care for [name]Cadence[/name]. [name]Hana[/name] [name]Cadence[/name] flows nicely, though. [name]Both[/name] [name]Greta[/name] and [name]Hana[/name] are beautiful, classic choices, and either would be wonderful.
I like the flow of [name]Hana[/name] [name]Day[/name] Lippincott even though I prefer the name [name]Greta[/name] to [name]Hana[/name]. I dislike the name [name]Cadence[/name] with both [name]Hana[/name] and [name]Greta[/name]. I think a one syllable mn is your best bet…there is a thread (Nameberry - Welcome to the Nameberry Forums) regarding one syllable names and people have listed many options for both boys and girls.
Good luck