The poll is still new but the overwhelming consensus right now is that [name_f]Sosie[/name_f] is more my vibe as a nickname for something. So I’m curious…
The only name on my list that I think could lend itself to the nickname [name_f]Sosie[/name_f] is [name_f]Cassiopeia[/name_f]. What names that fit my vibe could also be [name_f]Sosie[/name_f]?
Thanks!
ETA: Sus@na is my mom’s name so variants of that are out!
Some of these might be a stretch but:
Shoshanna
Soraya
Sonora
Sophronia
Sophia / Sophie
Sorina
Susannah
Hosanna
Sohla
Sonya / Sonia / Sonja
Persephone
I know a [name_f]Suzanne[/name_f] who goes by [name_f]Sosie[/name_f]. [name_f]Susanna[/name_f] or [name_f]Susan[/name_f]?
Solaris nn [name_f]Sosie[/name_f] is all I’ve got rn. That is a hard one! I did think of [name_f]Shoshanna[/name_f], as the pp recommended. I’m not sure how much of a stretch you are willing for.
Maybe [name_u]Solstice[/name_u] or [name_u]Solace[/name_u] nn [name_f]Sosie[/name_f].
I should’ve mentioned this in the initial post but my mom’s name is a spelling of [name_f]Susannah[/name_f] so that and any of its variants are out! [name_f]My[/name_f] bad.
@itsjustjack, @columbiacharm, and @WhiteGardenia thank you! [name_f]Sonora[/name_f] and Sohla are interesting, and I love the idea of [name_u]Solstice[/name_u] or [name_u]Solace[/name_u] as first names!
First of all, I adore [name_f]Sosie[/name_f]! 
Am I imagining that you’ve had [name_f]Cosima[/name_f] on your list? I could totally see [name_f]Cosima[/name_f] nn. [name_f]Sosie[/name_f]! I’ll come back if I can think of anything else!
Sosie reminds me of a cute little nickname/petname an older sibling would say if/when they couldn’t pronounce [name_f]Josephine[/name_f]/Josie.
It might be a stretch but I think it could work.
@dandy_orchid [name_f]Cosima[/name_f] nn [name_f]Sosie[/name_f] is a great idea!
@WannabeAunty thank you! I’m not a big fan of [name_f]Josephine[/name_f] but it would make a great nn.
I think any [name_f]Rose[/name_f] name would work! [name_f]Rosemary[/name_f], [name_f]Rosalie[/name_f], [name_f]Primrose[/name_f], etc
Cassiopeia nn [name_f]Sosie[/name_f] is really cute and unexpected
Not sure if they’re quite your style but [name_f]Sosie[/name_f] as a nn for…
Sophronia
[name_f]Rosalie[/name_f]
[name_f]Saoirse[/name_f]
[name_f]Soraya[/name_f]
[name_f]Shoshana[/name_f]
[name_f]Isola[/name_f]
[name_f]Rhapsody[/name_f]
@Kipperbo1 thank you! [name_f]Primrose[/name_f] is the only in that category that I really like but I hesitate because I’m not a big fan of The Hunger Games.
I’m not either but it’s still on my list 
I think of the flower, not the character
I can see a [name_f]Sosie[/name_f] as a nickname for
[name_f]Josephine[/name_f]
[name_f]Shirley[/name_f]
[name_f]Stephanie[/name_f]
[name_f]Persephone[/name_f]
[name_f]Shoshauna[/name_f]
[name_u]Shannon[/name_u]
[name_f]Roseanna[/name_f]
[name_f]Thomasina[/name_f]
Solaris
[name_u]Solstice[/name_u]
[name_f]Solange[/name_f]
Sosie means [name_f]Lily[/name_f] so I imagine it could also be an [name_f]Lily[/name_f] variant nickname … so again [name_f]Shoshauna[/name_f]
Perhaps [name_f]Soleil[/name_f] “[name_f]Sosie[/name_f]”?
I was going to say Soshanna and [name_f]Susannah[/name_f], but those,might be too c loo se to your mom’s name
Sisley or [name_f]Saskia[/name_f]?
I suggested [name_f]Isobel[/name_f] nn [name_f]Sosie[/name_f] to someone else
Sophie or [name_f]Sophia[/name_f]
The first name I thought of was [name_f]Zosia[/name_f] pronounced ([name_m]Zo[/name_m]-shah) or ([name_m]Zo[/name_m]-see-ah).
Dosia/Theodosia
[name_f]Salome[/name_f]
[name_u]Sorrel[/name_u]
[name_f]Sonnet[/name_f]
[name_f]Ambrosia[/name_f]
[name_f]Bellerose[/name_f]
[name_f]Cosette[/name_f]
[name_f]Cosmina[/name_f]
[name_f]Mariposa[/name_f]
[name_u]Rosario[/name_u]
Essentially, I think anything beginning with So and containing os will work 