Aw I love your taste in names, they all feel quite cool and a bit surname-y, but still soft.
My favourite with [name_m]Elias[/name_m] [name_m]Edward[/name_m] is probably [name_f]Marlowe[/name_f]. I think [name_m]Elias[/name_m] and [name_f]Marlowe[/name_f] sound really lovely together, and [name_f]Marlowe[/name_f] feels stylish without being too trendy. [name_f]Quinn[/name_f] is also gorgeous, very simple and strong, though maybe a bit sharper next to [name_m]Elias[/name_m].
I do really like [name_m]Augustine[/name_m] “August” as well. It feels special and a bit unexpected, but still warm. I’d maybe only use it if you’re happy with something a bit bolder, because it does feel more unusual than the others.
[name_f]Leighton[/name_f] and [name_m]Emerson[/name_m] are nice too, but they feel a tiny bit more modern/trendy to me, whereas [name_m]Elias[/name_m] feels quite classic and gentle.
Some others you might like are [name_f]Willa[/name_f], [name_f]Arden[/name_f], [name_f]Sloane[/name_f], [name_f]Blair[/name_f], [name_f]Maeve[/name_f], [name_m]Rowan[/name_m], [name_f]Florence[/name_f], [name_f]Beatrice[/name_f], [name_f]Louisa[/name_f], [name_f]Imogen[/name_f], [name_m]Hollis[/name_m], or [name_f]Thea[/name_f].
My top picks would be [name_f]Marlowe[/name_f], [name_f]Quinn[/name_f], or [name_m]Augustine[/name_m]. I think [name_f]Marlowe[/name_f] is the easiest fit, and [name_m]Augustine[/name_m] is the most interesting.