Seydina "Sydney"

I don't quite get the connection between Seydina and Sydney; they seem like very different names to me, and I think Seydina is prettier. Other options: Selah, Demy, Whitney, Jasmine, Ayla, Lizzy, Aïcha, Saphira, Kelsey, Caitlynn, Celine, Chelsea, Scarlett, Savannah, Jayda, Skylar, Aïda.

Honestly, I don't see any resemblance either, and I think Seydina is a boy's name .
I really like Sydney but can't really think of a middle name, maybe Sidna, Sydneya?
Other options:
Elisabeth - Lizzy
Jaclyn - Jackie
Ellemieke - Elly
Bodine - Bo
Josephine - Fien
Eliana - Lia
Ameylia - Mey
Alex(i)a - Lexi, Lexa
Anne-Louise - Loïs
Charlize - Lizzy, Lize

Good luck! xo