[name]Mariana[/name], [name]Adelina[/name], and [name]Cosima[/name] all sound like beautiful Italian derivative names to me. I [name]LOVE[/name] [name]Cosima[/name].
And I think [name]Luca[/name] would be a perfect fit for a boy’s name.
Here are what I think are similar sounding names in regards to flow and origins, but I’ve tried to find ones with a different ending sound than the ‘na’ and ‘ma’ on your current girls’ names, though some slipped in there anyway : ) :
[name]Antonella[/name]
[name]Benedetta[/name]
[name]Bianca[/name]
[name]Brigida[/name]
[name]Francesca[/name] (my fav for being similar yet different enough to the others, and lot so cute nn options if you like)
[name]Gemma[/name]
[name]Lavinia[/name]
[name]Loretta[/name]
[name]Lucia[/name]
[name]Lucrezia[/name]
[name]Rosalia[/name]
[name]Rosetta[/name]
[name]Serafina[/name]
[name]Teodora[/name]
[name]Valeria[/name]
[name]Valentina[/name]
I don’t know if you want another flower middle name for a girl, but I think it would be nice to stick with a classic name for a middle. Perhaps:
[name]Camelia[/name]
[name]Claire[/name]
[name]Dahlia[/name]
[name]Delia[/name]
[name]Delphine[/name]
[name]Grace[/name]
[name]Hope[/name]
[name]Iris[/name]
[name]June[/name]
[name]Lily[/name]
[name]Lillian[/name]
[name]Pearl[/name]
I’m fond of the idea of [name]Francesca[/name] [name]Pearl[/name] for a girl myself. : )
For boys, [name]Walker[/name] and [name]Luca[/name] are very different names, but I think both of them have a stong and mascuilne quality to them. But I think [name]Walker[/name] would not go very well with your daughters names. I think [name]Luca[/name] goes perfectly!
[name]Just[/name] in case, what about:
[name]Clemente[/name] or [name]Clement[/name]
[name]Damon[/name]
[name]Damian[/name]
[name]Dante[/name]
[name]Darius[/name] or [name]Dario[/name]
[name]Enzo[/name]
[name]Lazaro[/name]
[name]Lorenzo[/name]
[name]Maximilian[/name]
[name]Nico[/name]
[name]Rocco[/name]
[name]Roman[/name]
I don’t know if that helps at all, but good luck with whatever you decide! : )