Honestly, I've never heard of
Danika, but
Danica is definitely Serbian. Also
Iva and
Mila (
Mila can be a name by itself, meaning "favoured" from the Slavic "mil" - favour) are popular in Bulgaria and Serbia.
Lala (Lalka) is used in Bulgaria, although it's kinda old-fashioned. So is
Neva, but the common assumption in Bulgaria is that it comes from the name of the Russian river
Neva.
Lorelei, I believe, definitely belongs to the mythology section. And one question - why is
Hamlet not in the Lit-section?