Generally, I really like your naming style.
It is hard for me to like any form of the name, except
Wilhelmina, because I do love it so... :)
My favorites of yours are:
Cecilia - Works in so many cultures.
AstridSybilla
FeliksJohannes - I love this name, however I do not feel linked enough to a culture that uses this name to use it myself.
Otto