If you were considering [name_m]Sylvander[/name_m] / Silvander (which I think suits him well), you may like [name_m]Silvestre[/name_m] (a variant of Sylvester), [name_m]Sylvester[/name_m] / Silvestor perhaps just [name_m]Silver[/name_m].
Other suggestions include:
[name_m]Kieran[/name_m]
[name_m]Cillian[/name_m]
[name_m]Percival[/name_m]
[name_m]Prentice[/name_m]
[name_m]Malachi[/name_m]
[name_m]Colm[/name_m]
[name_m]Lorcan[/name_m]
[name_m]Lysander[/name_m]
[name_m]Edmund[/name_m]
Eaman
[name_m]Ewan[/name_m]
[name_m]Leander[/name_m]
[name_m]Soren[/name_m]
[name_m]Asmodeus[/name_m]
[name_m]Lucifer[/name_m]
I hope these come in handy, but if they don’t, I’d be more than willing to try and think of more🙂.
By the way, Datura is a lovely name.