I think Satiayna when pronounced is very pretty, I am unsure of the spelling though, I think it will be very hard for people to pronounce when reading it. Have you thought of a more tradition way like Satiana, I know the 'Y' looks pretty in your version but it is slightly confusing. Maybe even... Satiyana, to be able to keep the 'Y' as it is a lovely name.

I love scarlett, have for years since I used to care for a baby... Scarlett Angel... she will be about 7 now! The name is very popular these days though.

I haven't actually thought too much about the spelling LOL.
I heard it the other day and quite liked it. We aren't even TTC #2 until the end of the year, but Hey... I can start thinking about names now LOL its fun!!