We’re down to our last two contenders for our third child:
[name_f]Sylvie[/name_f] [name_f]Marilyn[/name_f] or [name_f]Sylvie[/name_f] [name_u]Poet[/name_u]
We already have a daughter named [name_f]Emme[/name_f] [name_u]Dylan[/name_u] and a son named [name_u]Theo[/name_u] [name_m]Asher[/name_m].
When I first saw [name_f]Sylvie[/name_f] [name_u]Poet[/name_u], all I could think was [name_f]Sylvia[/name_f] Plath…who was a poet! I’m not sure if that will be a common connotation, but unless you are purposely making a [name_f]Sylvia[/name_f] Plath connection I’d probably avoid it. I also prefer the flow with [name_f]Marilyn[/name_f], two syllables and then three is more pleasing to the ear and less choppy.
[name_f]Sylvie[/name_f] [name_u]Poet[/name_u].
[name_f]Marilyn[/name_f] is too similar to [name_u]Dylan[/name_u]. Too many Y’s with [name_f]Sylvie[/name_f] in the mix as well.
Sylvie Marilyn has much better flow. In contrast, Sylvie Poet sounds a little choppy. Best wishes!
P.S. If you really want to use Poet, it would sound better as Sylvia Poet. (The difference being that Sylvia is a three-syllable name, while Sylvie is two syllables.)
I love both names, I think it depends on what “feel” you want to go for. [name_f]Sylvie[/name_f] [name_f]Marilyn[/name_f] reminds me of Old Hollywood: all things glitz, glamour, and class. [name_f]Sylvie[/name_f] [name_u]Poet[/name_u] on the other hand is light, fun, and whimsical. It makes me think of butterflies, carousels, kites, etc… I have no idea if that makes any sense lol.
I like [name_f]Sylvie[/name_f] [name_u]Poet[/name_u] but [name_u]Poet[/name_u] as a name is a huge love for me! I think [name_f]Sylvie[/name_f] [name_u]Poet[/name_u] is light, and fresh with an artistic flair. I am not a fan of the name [name_f]Marilyn[/name_f] to be honest though, it is not my style though so don’t let that dissuade you. 
In the long run both are great choices. Seriously very cute names.
[name_f]Sylvie[/name_f] [name_f]Marilyn[/name_f]–it flows better and fits in better with her siblings’ names.
Exactly my thoughts.
[name_f]Sylvie[/name_f] [name_u]Poet[/name_u] is gorgeous.
I personally prefer [name_f]Marilyn[/name_f] over [name_u]Poet[/name_u], but I have to say [name_f]Sylvie[/name_f] [name_u]Poet[/name_u] might work better in your sibset.
I like the flow of [name_f]Sylvie[/name_f] [name_u]Poet[/name_u].
I love the look and flow of [name_f]Sylvie[/name_f] [name_f]Marilyn[/name_f]. Like someone else said, it has a wonderful Old Hollywood feel to it. [name_f]Sylvie[/name_f] [name_u]Poet[/name_u] is less evocative and does not flow as well in my mind.