I don't like
Sebastiana at all. To me it just looks like
Sebastian with an 'a' slapped on the end instead of a feminine variant.
Here are some mn suggestions, anyway:
Sebastiana RoseSebastiana Philomene
Sebastiana PriyaSebastiana Elora
Sebastiana Mairi
Sorry if I've been a bit of a pain.
Favourite Names:
Boy: Christian Adelmar Girl: Freya Amaryllis