Ooh this is fun...

Here are some suggestions...

Anielka - Gracious/Beaautiful - Polish
Anya - Gracious - Russian
Milena - People's Love - Russian
Nadia - Hope - Slavic
Saskia - Protector of Mankind - Slavic
Elke - Noble/Kind - Dutch
Schuyler - Scholar - Dutch (pro. Shy-ler)

I like Mariska from your list and also Ilinka.