We have no idea what to use.
Nothing too popular or filler type names. (Ie: [name]Grace[/name], [name]Elizabeth[/name])
I used to live in a town called [name]Roslyn[/name] haha 
[name]Jade[/name]
[name]Alessandra[/name]
[name]Penelope[/name]
[name]Georgina[/name]
[name]Danica[/name]
[name]Veronica[/name]
[name]Savannah[/name]
those are some names that come to mind that could be nice middle names for [name]Roslin[/name].
For me, any name used in the middle spot is a filler name if it has no meaning for you. So… if I were you, I’d go through my family tree and think of all the places I’ve lived and see if you can find a name or a variation of a name of an ancestor, street name, city name etc. that you like. Or… you could give us Berries names of favourite ancestors & places and we could make lists based on your family
We don’t really want to use a family name. Our son is named after my dad an need that caused issue lol.
More just looking for a not overly common middle name that’s not too off the wall.
She will be sister to [name]Orion[/name] [name]Victor[/name]
Hmm. What’s most important to you? For example, do you want something really feminine or something that flows really well? [name]Do[/name] you care about meaning or initials? Are there any names that you really like, but can’t use? [name]How[/name] many syllables at in your last name?
For flow, i would say, stay away from two syllable names or anythin that ends in in, en, on or yn.
[name]Just[/name] off the top of my head, I like:
[name]Roslin[/name] [name]Matilda[/name]
[name]Roslin[/name] Fiametta
[name]Roslin[/name] [name]Beatrice[/name]
[name]Roslin[/name] [name]Susannah[/name]
[name]Roslin[/name] [name]Miranda[/name]
[name]Roslin[/name] [name]Eulalia[/name]
[name]Roslin[/name] [name]Fern[/name]
[name]Roslin[/name] pearl
[name]Roslin[/name] [name]June[/name]
[name]Roslin[/name] [name]Lark[/name]
Ps I really love your son’s name!
Thanks on my son’s name 
dh has initials that spell LAP so we are trying to avoid that lol…
Definitely want to avoid similar endings.
Also pronouncing the name roz-lyn not [name]Ross[/name]-lyn as some have tried lol.
[name]Love[/name] [name]Matilda[/name]!
Also, our last name has a hard P sound similar to [name]Penelope[/name] and ends in on
Also just thought of [name]Roslin[/name] [name]Hannelore[/name]. Good luck!
Definitely want a feminine middle
I have a daughter whose middle names are [name]Meredith[/name] Rhoslyn.
[name]Roslin[/name] [name]Meredith[/name] is pretty, but maybe not feminine enough given it’s technically a unisex name in [name]Wales[/name]?
My aunt’s called [name]Roslynn[/name], but I can’t for the life of me remember her middle name to suggest.
Ideas:
[name]Roslin[/name] [name]Alice[/name]
[name]Roslin[/name] [name]Cassandra[/name]
[name]Roslin[/name] [name]Juliet[/name]
[name]Roslin[/name] [name]Marina[/name]
[name]Roslin[/name] [name]Ophelia[/name]
[name]Roslin[/name] [name]Samara[/name]
[name]Roslin[/name] [name]Violet[/name]
[name]Roslin[/name] [name]Aurelia[/name]
[name]Roslin[/name] [name]Mariah[/name]
[name]Roslin[/name] [name]Angelica[/name]
[name]Roslin[/name] [name]Bellamy[/name]
[name]Roslin[/name] [name]Camelia[/name]
[name]Roslin[/name] [name]Cordelia[/name]
[name]Roslin[/name] [name]Carina[/name]
[name]Roslin[/name] [name]Fiona[/name]
[name]Roslin[/name] [name]Ciara[/name]
[name]Roslin[/name] [name]Emerald[/name]
[name]Roslin[/name] [name]Arabelle[/name]
[name]Roslin[/name] [name]Viola[/name]
[name]Roslin[/name] [name]Mattea[/name]
[name]Roslin[/name] [name]Miranda[/name]
[name]Roslin[/name] [name]Mariel[/name]
[name]Roslin[/name] [name]Maribel[/name]
I’m loving [name]Roslin[/name] [name]Claire[/name] right now.
Dh thinks a lot of the 3 syllable names make it sounds like a mouthful. Lol