I like [name_f]Sylvie[/name_f] the best, generally and with an L last name.
I think [name_f]Dahlia[/name_f] is nice but depending on how you say it isn’t as good with an L last name. It would be my second choice.
[name_f]Calla[/name_f] is L heavy with and L last name - it’ll trip people up.
[name_f]Dove[/name_f] is free spirited & cute - but I would use [name_f]Dove[/name_f] as a middle name (that you then use as a first as well - [name_f]Sylvie[/name_f] [name_f]Dove[/name_f] is very pretty!) or I would use a name that means dove, like [name_f]Jemima[/name_f] or [name_f]Paloma[/name_f] (though not sure [name_f]Paloma[/name_f] flows to your L last name?). A lot of this also depends on last name syllable count.
[name_m]Westley[/name_m] is one of my fave names! It’s so charming! I’m a bit unsure about it with an L last name (it depends on what type of L last name - eg wouldn’t go super well with [name_m]Lee[/name_m] or a last name starting with Lee).
[name_m]Hudson[/name_m] and [name_m]Rowan[/name_m] are more grounded and solid - [name_m]Hudson[/name_m] feels more sporty and [name_m]Rowan[/name_m] a little more artsy but both more “solid boy”. I like both but [name_m]Rowan[/name_m] would be my preference of the two and my second choice.
[name_m]River[/name_m] is a different proposition to the other boys’ names, it’s more dreamy and slightly boho. It’s immediately likeable!
[name_f]Shiloh[/name_f] is the same as [name_f]Calla[/name_f] and probably too L heavy and tongue twisting. It would be a good middle I think.
So besides flow to last name, I’d think more about style and vibes you’d like!