I love [name_m]Delfino[/name_m]! It’s a close friend’s surname, and I find it so melodic and pretty!
From your choices, I think [name_m]Isaac[/name_m] [name_u]Francis[/name_u] [name_m]Delfino[/name_m] and [name_m]Isaac[/name_m] [name_u]Rhys[/name_u] [name_m]Delfino[/name_m] are my favourites!
[name_m]Isaac[/name_m] [name_m]Delfino[/name_m] is great, so I think you can’t really go wrong with any of your options!