[name_m]Gideon[/name_m] was the first one that popped into my mind of seeing the post title, so glad to see it on your list!! I also like [name_u]Amos[/name_u], [name_u]Adrian[/name_u], [name_m]Eben[/name_m] and [name_m]Samuel[/name_m] for you!!
With [name_f]Phoebe[/name_f] and [name_u]Leo[/name_u], I’d also consider…
[name_u]Maxwell[/name_u]! [name_f]Phoebe[/name_f] was our top choice if this bean was a girl, and [name_u]Leo[/name_u] is one my DH loves. We’re using [name_u]Maxwell[/name_u] this time. [name_m]Maximilian[/name_m] is also great! What sold me on [name_u]Maxwell[/name_u] & [name_f]Phoebe[/name_f] were the nicknames [name_u]Max[/name_u] & [name_f]Bee[/name_f] together.
These are my personal faves! So sweet and strong. I especially adore the “eo” / “oe” pattern continuing in Gideon! That’s really special. A fantastic name that just so happens to fit the theme perfectly. So subtle and a lovely tie-in to three siblings. x
As been said I really like the subtle ‘eo/oe’ theme so [name_m]Gideon[/name_m] would be my top choice. But style wise is say [name_m]Maximilian[/name_m], [name_u]Amos[/name_u] and [name_u]Adrian[/name_u] also fit.