I love Mattea, spelled thusly. The other spellings look strange to me.
Mattea
Caroline, Mattea
Charlotte, Mattea
Elinor, and
Hannah Mattea are all gorgeous.
From your sibsets, I like:
Mattea and
CharlotteMattea and
JohannaMattea and
Hanna /
HannahMattea and
EmmaMattea and
EmiliaMattea and
ElisaMattea and
LukasMattea and
JonasMattea and
JakobMattea and
Samuel